UVa 424

#include<bits/stdc++.h>
using namespace std;

typedef unsigned long long int  ull;
typedef long long int      ll;
typedef vector<int>        vi;
typedef vector<ll>         vll;
typedef vector<vi>         vvi;
typedef pair<int,int >     pii;
typedef vector< pii >      vpii;
typedef set<int>           sti;

#define sc                 scanf
#define pf                 printf
#define sci(n)             scanf("%d",&n)
#define scl(n)             scanf("%lld",&n)
#define scd(n)             scanf("%lf",&n)
#define scs(s)             scanf("%s",s)
#define pfi(n)             printf("%d",n)
#define pfl(n)             printf("%lld",n)
#define pff(n)             cout<<n
#define line               printf("\n")
#define spc                printf(" ")
#define loop(i,x,y)        for(int i=int(x); i<=int(y); i++)
#define rloop(i,y,x)       for(int i=int(y); i>=int(x); i--)
#define cspf(i)            printf("Case %d: ", i)
#define pb                 push_back
#define mp                 make_pair
#define ff                 first
#define ss                 second
#define all(v)             v.begin(),v.end()
#define rall(v)            v.rbegin(),v.rend()
#define read()             freopen("input.txt", "r", stdin)
#define write()            freopen("output.txt", "w", stdout)
/// Constants
#define eps                1e-9
#define PI                 acos(-1.0)  // 3.1415926535897932
#define MAX                1000009

vector<string>num;
int mx=0;

void cal()
{
    int carry=0,temp,mod,i=0,j;
    char digit;
    string sum;
    for(i=0;i<mx;i++){
        temp=carry;
        for(j=0;j<num.size();j++){
            if(i<num[j].size()){
                temp=temp+(num[j][i]-'0');
            }
        }
        mod=temp%10;
        sum.insert(sum.begin()+i,mod+'0');
        carry=temp/10;
    }
    if(!mx)
        sum.insert(sum.begin()+i,'0');
    while(carry){
        mod=carry%10;
        sum.insert(sum.begin()+i,mod+'0');
        i++;
        carry/=10;
    }
    reverse(sum.begin(),sum.end());
    cout<<sum<<endl;
}

int main()
{
    read();
    write();
    string s;
    while(true){
        cin>>s;
        if(s.size()==1 && s[0]-'0'==0) break;
        int sz=s.size();
        if(sz>mx) mx=sz;
        reverse(s.begin(),s.end());
        num.push_back(s);
    }
    cal();
    return 0;
}