const w = parseInt(readline());
for (let i = 0; i < w; i++) {
    const wall = readline();
}
const d = parseInt(readline());
for (let i = 0; i < d; i++) {
    const door = readline();
}

// Write an answer using console.log()
// To debug: console.error('Debug messages...');

console.log('0 C4 needed to go through 0 walls');