#include <bits/stdc++.h>
using namespace std;
 
int main() {
    string s; cin >> s;
    int l, r;
    // tìm kí tự chữ số bên trái
    for(int i = 0; i < s.size(); ++ i) { 
        if('0' <= s[i] && s[i] <= '9') { // kiểm tra nếu s[i] là kí tự số
            l = s[i] - '0';
            break;
        }
    }
    // tìm kí tự chữ số bên phải
    for(int i = s.size() - 1; i >= 0; -- i) {
        if('0' <= s[i] && s[i] <= '9') {
            r = s[i] - '0';
            break;
        }
    }
    if(l != 0) cout << l; // chỉ in ra khi bên trái khác 0
    cout << r;
}

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