const input = require('fs').readFileSync('/dev/stdin', 'utf8');
const [[N], S, T] = input.split('\n').map(v => v.split(/\s/));
for (i in S) {
  if (S[i] != T[i]) {
    console.log(`${Number(i) + 1}\n${S[i]}\n${T[i]}`);
    break;
  }
}