Problem:
Score : 100 points

Problem Statement

This contest, AtCoder Beginner Contest, is abbreviated as ABC.

When we refer to a specific round of ABC, a three-digit number is appended after ABC. For example, ABC680 is the 680th round of ABC.

What is the abbreviation for the N-th round of ABC? Write a program to output the answer.

Constraints

100 ≤ N ≤ 999

Input

Input is given from Standard Input in the following format:

N

Output

Print the abbreviation for the N-th round of ABC.

Sample Input 1

100

Sample Output 1

ABC100

The 100th round of ABC is ABC100.

Sample Input 2

425

Sample Output 2

ABC425

Sample Input 3

999

Sample Output 3

ABC999

Solution in C (Clang 3.8.0) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <stdlib.h>

int a[200000], b[200000], ac, bc;

int solve() {
  for(int i = 0; i < ac; i++) {
    for(int k = 0; k < bc; k++) {
      if(a[i] == b[k]) return 1;
    }
  }
  return 0;
}

int main() {
  int n, m;
  scanf("%d %d", &n, &m);
  for(int i = 0; i < m; i++) {
    int _a, _b; scanf("%d %d", &_a, &_b);
    if(_a == 1) {
      a[ac++] = _b;
    } else if(_b == n) {
      b[bc++] = _a;
    }
  }
  puts(solve() ? "POSSIBLE" : "IMPOSSIBLE");
}