#include

<

iostream

>

using

namespace

std;

char

a[

1001

] ;

char

x_a[

1001

] , y_b[

1001

] ;

char

xx[

1001

] , yy[

1001

];

char

x1[

1001

] , y1[

1001

];

int

Lx , Ly ;

int

sum[

1001

] ;

int

num ;

int

sign

=

0

;

int

mark_x , mark_y ;

int

x[

1001

],y[

1001

];

void

Init_A()

//

将字符转化为数字

{

int

i;

for

( i

=

0

; i

<

Lx ; i

++

) x[i]

=

x_a[i]

-

'

0

'

;

for

( i

=

0

; i

<

Ly ; i

++

) y[i]

=

y_b[i]

-

'

0

'

;

}

void

Init_S()

{

int

i;

for

( i

=

0

; i

<

Lx ; i

++

) x1[Lx

-

i

-

1

]

=

x_a[i] ;

for

( i

=

0

; i

<

Ly ; i

++

) y1[Ly

-

i

-

1

]

=

y_b[i];

strcpy(x_a , x1);

strcpy(y_b , y1);

Init_A();

}

void

Change()

//

交换x,y,如果x<y;

{

strcpy( a , y_b) ;

strcpy( y_b , x_a ) ;

strcpy( x_a , a ) ;

int

temp

=

Lx ;

Lx

=

Ly ;

Ly

=

temp;

}

void

Cmp( )

//

保证x>=y

{

int

i;

if

(Lx

<

Ly) { sign

=

1

; Change();}

if

(Lx

==

Ly)

{

for

( i

=

0

; i

<

Lx ; i

++

)

if

(x_a[i]

<

y_b[i])

break

;

if

( i

!=

Lx )

{

sign

=

1

;

Change();

}

}

}

void

Add()

//

高精度加法

{

num

=

0

;

int

i , j , flag

=

0

;

for

( i

=

Lx ,j

=

Ly ; i

>=

Lx

-

Ly , j

>=

0

; i

--

, j

--

)

{

sum[num

++

]

=

( x[i]

+

y[j]

+

flag)

%

10

;

flag

=

( x[i]

+

y[j]

+

flag)

/

10

;

}

for

(i

=

Lx

-

Ly

-

1

; i

>=

0

; i

--

)

{

sum[num

++

]

=

( x[i]

+

flag )

%

10

;

flag

=

( x[i]

+

flag )

/

10

;

}

while

(flag)

{

sum[num

++

]

=

flag

%

10

;

flag

/=

10

;

}

}

void

Sub()

//

高精度减法

{

num

=

0

;

int

i ;

for

(i

=

0

;i

<

Lx; i

++

)

{

sum[i]

+=

x[i]

-

y[i];

if

(sum[i]

<

0

)

{

sum[i

+

1

]

--

;

sum[i]

+=

10

;

}

}

while

( Lx

>

1

&&

sum[Lx

-

1

]

==

0

) Lx

--

;

num

=

Lx;

}

void

PrintAdd()

{

int

i;

for

(i

=

num

-

1

;i

>

0

;i

--

)

printf(

"

%d

"

,sum[i]);

}

void

PrintSub()

{

int

i;

for

(i

=

num

-

1

;i

>=

0

; i

--

)

printf(

"

%d

"

,sum[i]);

}

int

main()

{

while

(scanf(

"

%s%s

"

,xx, yy)

!=

EOF)

{

int

L1

=

strlen(xx);

int

L2

=

strlen(yy);

num

=

0

; sign

=

0

;

memset( sum ,

0

,

sizeof

(sum));

memset( x ,

0

,

sizeof

(x));

memset( y ,

0

,

sizeof

(y));

memset( x_a ,

0

,

sizeof

(x_a));

memset( y_b ,

0

,

sizeof

(y_b));

memset( x1 ,

0

,

sizeof

(x1));

memset( y1 ,

0

,

sizeof

(y1));

mark_x

=

mark_y

=

0

;

Lx

=

L1;

Ly

=

L2;

int

i;

if

( xx[

0

]

==

'

-

'

||

xx[

0

]

==

'

+

'

)

{

if

(xx[

0

]

==

'

-

'

) mark_x

=

1

;

for

( i

=

1

; i

<

Lx ; i

++

) x_a[i

-

1

]

=

xx[i];

Lx

=

Lx

-

1

;

}

if

(xx[

0

]

!=

'

-

'

&&

xx[

0

]

!=

'

+

'

)

{

for

(i

=

0

;i

<

Lx;i

++

) x_a[i]

=

xx[i];

}

if

(yy[

0

]

==

'

-

'

||

yy[

0

]

==

'

+

'

)

{

if

(yy[

0

]

==

'

-

'

) mark_y

=

1

;

for

(i

=

1

; i

<

Ly ; i

++

) y_b[i

-

1

]

=

yy[i];

Ly

=

Ly

-

1

;

}

if

(yy[

0

]

!=

'

-

'

&&

yy[

0

]

!=

'

+

'

)

for

(i

=

0

;i

<

Ly;i

++

) y_b[i]

=

yy[i];

if

(mark_x

==

0

)

{

if

( mark_y

==

0

)

{

Cmp();

Init_S();

Sub();

if

(sign

==

1

) printf(

"

-

"

);

PrintSub();

}

if

(mark_y

==

1

)

{

Cmp();

Init_A();

Add();

PrintAdd();

}

}

if

(mark_x

==

1

)

{

if

( mark_y

==

0

)

{

Cmp();

Init_A ();

Add();

printf(

"

-

"

);

PrintAdd();

}

if

(mark_y

==

1

)

{

Cmp();

Init_S();

Sub();

if

(sign

==

0

) printf(

"

-

"

);

PrintSub();

}

}

printf(

"

\n

"

);

}

return

0

;

}