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 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>
#include<stdlib.h>
#define SIZE 200005

int from[SIZE] = {0};
int to[SIZE] = {0};

int main()
{
  int i;
  int n, m;
  int a, b;
  scanf("%d %d", &n, &m);

  for(i = 0; i < m; i++){
    scanf("%d %d", &a, &b);
    if(a == 1){
      from[b] = 1;
    }
    if(b == n){
      to[a] = 1;
    }
  }

  for(i = 0; i < SIZE; i++){
    if(from[i] && to[i]){
      printf("POSSIBLE\n");
      return 0;
    }
  }
  return 0*printf("IMPOSSIBLE\n");
}