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: Runtime Error)

#include <stdio.h>

struct{
  int start;
  int goal;
}root[100];


int main(){
  int n,m;
  fscanf(stdin,"%d %d",&n,&m);
  for(int i=0; i<m ; i++){
    fscanf(stdin,"%d %d",&root[i].start,&root[i].goal);
  }

  int first[m];
  int j=0;
  for(int i=0; i<m; i++){
    if(root[i].start == 1){
      first[j] = root[i].goal;
      j++;
    }
  }

  int flag = 0;
  for(j=0; j<m; j++){
    for(int i=0; i<m; i++){
      if(root[i].start == first[j]){
        if(root[i].goal == n) flag=1;
      }
    }
  }

  if(flag==1){
    printf("POSSIBLE\n");
  }else{
    printf("IMPOSSIBLE\n");
  }
  return 0;
}