801B - Valued Keys - CodeForces Solution

constructive algorithms greedy strings *900

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Python Code: 

x = input()
y = input()

z = ""

for i, l in enumerate(y):
    if l > x[i]:
        z = "-1"
        break
    elif l <= x[i]:
        z += l

print(z)

C++ Code: 

#include <bits/stdc++.h>

using namespace std;

int main() {
    string x, y;
    cin >> x >> y;

    int check = 1;
    for (int i = 0 ; i < x.size() ; i++)
        check &= (x[i] >= y[i]);

    if (check)
        cout << y << endl;
    else
        cout << -1 << endl;

    return 0; 
}


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