Untitled

#include <iostream>
#include <string>

using namespace std;

int main() {
    string n;
    int d, m, y;
    bool isLeap = 1;
    
    cin >> n;
    
    d = (int) (n[0] - 48) * 10 + (int) (n[1] - 48);
    m = (int) (n[3] - 48) * 10 + (int) (n[4] - 48);
    y = (int) (n[6] - 48) * 1000 + (int) (n[7] - 48) * 100 + (int) (n[8] - 48) * 10 + (int) (n[9] - 48);
    
    switch (m) {
        case 1: case 3: case 5: case 7: case 8: case 10: case 12:
            if (d <= 31) {
                cout << "yes";
            } else {
                cout << "no";
            }
            break;
        case 4: case 6: case 9: case 11:
            if (d <= 30) {
                cout << "yes";
            } else {
                cout << "no";
            }
            break;
        case 2:
            isLeap = (y % 4 == 0 && y % 100 != 0) || (y % 400 == 0);
            if (d <= (isLeap ? 29 : 28)) {
                cout << "yes";
            } else {
                cout << "no";
            }
            break;
        default:
            cout << "no";
            break;
    }
    
    return 0;
}