1120.cpp

#include <stdio.h>
#include <iostream>
#include <sstream>

int main(){
    int n, i, j, zero, cont;
    long long int num;
    char number[101];
    
    while(std::cin >> n){
        scanf("%s",number);
        
        if(n == 0 && number[0] == '0') break;
        
        char changed[101];
        i = 0;
        j = 0;
        zero = 0;
        num = 0;
        cont = 0;
        while(true){
                if(number[i] == '\0'){
                    break;
                }
                else if(number[i] == n+48){
                    i++;
                }
                else{
                    changed[j] = number[i];
                    if(j == zero) cont++;
                    if(number[i] == '0') zero++;
                    i++;
                    j++;
                }
        }
        changed[j] = '\0';
        
        std::stringstream f(changed);
        f >> num;
        
        if(j == 0){ printf("0\n"); }
        else if(j == zero){ printf("%lld\n", num); }
        else if(cont > 0){
            for(int k = cont-1; changed[k] != '\0'; k++){
                    printf("%d",changed[k]-48);
            }
            printf("\n");
        }
        else printf("%s\n", changed);
    }
    
    return 0;
}