#include <stdio.h>
#include <string.h>
#define MAX_N 1000005
#define FIN "next.in"
#define FOUT "next.out"

int N[ MAX_N ];
long long D;
char n[ MAX_N ];

int main( void )
{
    int i;
    long long t;
    freopen( FIN, "r", stdin );
    freopen( FOUT, "w", stdout );
    fgets( n, sizeof( n ), stdin );
    if ( n[ strlen( n ) - 1 ] == '\n' )
        n[ strlen( n ) - 1 ] = 0;
    scanf( "%lld", &D );
    for ( i = strlen( n ) - 1; i >= 0; i-- )
        N[ ++N[ 0 ] ] = n[ i ] - '0';

    for ( i = N[ 0 ], t = 0; i > 0; i-- )
        t = ( t * 10 + N[ i ] ) % D;
    for ( i = 1, t = ( D - t ) % D; i <= N[ 0 ] || t; i++, t /= 10 )
        N[ i ] = ( t += N[ i ] ) % 10;
    N[ 0 ] = i - 1;
    for ( i = N[ 0 ]; i > 0; i-- )
        printf( "%d", N[ i ] );
    printf( "\n" );
    return 0;
}