#include
     
      #include
      
       #include
       
        #include
        
         using namespace std;int main(){    char a[110][110];    int result[110];    int num = 0,index;    memset(a,'a',sizeof(a));        //没有初始化，wa 了好几次    memset(result,0,sizeof(result));    string s;    while(cin >> s){        if(s[0] == '0')            break;        index = 0;        for(int i = s.length() - 1; i >= 0; i--)  //将读入的字符串反转，低位在前            a[num][index++] = s[i];        num++;    }    int c = 0;    for(int i = 0; i < 110; i++){        int sum = 0;        for(int j = 0; j < num; j++){            if(isdigit(a[j][i]))                sum += a[j][i] - '0';        }        sum += c;        c = sum / 10;        result[i] = sum % 10;    }    int k;    for(k = 109; result[k] == 0; k--);           //忽略前导0    for(;k>=0;k--)        cout << result[k];    cout << endl;    return 0;}