import java.util.*;

	public class Main {
		public static void main(String[] args) {
			Scanner sc = new Scanner(System.in);
			int n = sc.nextInt();
			String [] s = new String[n];
			String [] t = new String[n];

			for( int i = 0; i < n; i++ ){
				s[i] = sc.next();
			}
			for( int i = 0; i < n; i++ ){
				t[i] = sc.next();
			}
			for( int i = 0; i < n; i++ ){
				if( !s[i] .equals(t[i])){
					System.out.println(i+1);
					System.out.println(s[i]);
					System.out.println(t[i]);
				}
			}
			sc.close();
		}
	}