<?php
    class In {
        private $arr = [];
        private $count = 0;
        private $pointer = 0;

        public function next_line() {
            $ret = "";
            if($this->has_next()){
                while($this->has_next()){
                    $ret .= $this->next();
                }
            }else{
                $ret = trim(fgets(STDIN));
            }
            return $ret;
        }

        public function next() {
            if(!$this->has_next()) {
                $str = trim(fgets(STDIN));
                $this->arr = explode(' ',$str);
                $this->count = count($this->arr);
                $this->pointer = 0;
            }
            $result = $this->arr[$this->pointer];
            $this->pointer++;
            return $result;
        }

        public function has_next() {
            return $this->pointer < $this->count;
        }

        public function next_int() {
            return (int)$this->next();
        }

        public function next_double() {
            return (double)$this->next();
        }
    }

    class Out {
        public static function println($str = "") {
            echo $str . PHP_EOL;
        }
    }

    $in = new In();

    $N = $in->next_int();
    for($i = 0;$i < $N;$i++) {
        $S[] = $in->next();
    }

    for($i = 0;$i < $N;$i++) {
        $T[] = $in->next();
    }

    for($i = 0;$i < $N;$i++) {
        if($S[$i] !== $T[$i]) {
            Out::println($i + 1);
            Out::println($S[$i]);
            Out::println($T[$i]);
        }
    }
?>