#include <iostream>
#include <cmath>
#include <string>
#include <algorithm>
#include <vector>

using namespace std;

bool cmp(vector<int> a, vector<int> b) {
    if (a.size() > b.size()) {
        return true;
    } else if (a.size() < b.size()) {
        return false;
    } else {
        int i = 0;
        while (i < a.size() && a[i] == b[i]) i++;
        if (i == a.size() || a[i] > b[i]) {
            return true;
        } else {
            return false;
        }
    }

}

vector<int> minV(vector<int> a, vector<int> b) {
    if (cmp(a, b)) {
        return b;
    } else {
        return a;
    }
}

vector<int> maxV(vector<int> a, vector<int> b) {
    if (cmp(a, b)) {
        return a;
    } else {
        return b;
    }
}

int main()
{
    vector<int> a, b, c;

    string s;
    getline(cin, s);
    long long d = 0;

    while (s[d] != ' ') {
        a.push_back(s[d] - '0');
        d++;
    }
    d++;

    while (s[d] != ' ') {
        b.push_back(s[d] - '0');
        d++;
    }
    d++;

    while (d < s.length()) {
        c.push_back(s[d] - '0');
        d++;
    }

    vector<int> ans = maxV( maxV(a, b), c );
    for (int i = 0; i < ans.size(); i++) {
        cout << ans[i];
    }


    return 0;
}