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++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < n; i++)
#define per(i,n) for(int i = n-1; i >= 0; i--)
using namespace std;
typedef long long ll;
typedef pair<int, int> P;
typedef pair<long long, long long> Pll;
typedef vector<int> vi;
typedef vector<ll> vll;

int main() {
  int n, m;
  cin >> n >> m;
  vector<bool> to(n,false),from(n,false);
  vi a(m); vi b(m);
  rep(i,m) {
    cin >> a[i] >> b[i];
    a[i]--; b[i]--;
    if(a[i]==0) to[b[i]] = true;
    if(b[i]==n-1) from[a[i]] = true;
  }
  rep(i,n) if(to[i]&&from[i]) {
    cout << "POSSIBLE" << endl;
    return 0;
  }
  cout << "IMPOSSIBLE" << endl;
  return 0;
}