function main(input) {
  const args = input.split('\n');
  const N = args[0];
  const ary = args[1].split(' ');
  let ans = 'Three';
  
  ary.forEach(elm => {
    if(elm === 'Y') { ans = 'Four' };
  });
  
  console.log(ans);
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'));