import std;

void main() {
    auto A = readln.chomp.split('.').to!(int[]);
    auto B = readln.chomp.split('.').to!(int[]);

    bool isFossil = true;
    foreach (a, b; zip(A, B)) {
        if (a < b) {
            isFossil = false;
            break;
        }
    }

    writeln(isFossil ? "YES" : "NO");
}