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 PyPy3 (2.4.0) (judge verdict: Runtime Error)

n,m=map(int,input().split())
a=[[int(i) for i in input().split()] for j in range(m)]
a.sort(key=lambda x:x[1])
a.sort(key=lambda x:x[0])
cc=0
for i in range(m):
    if a[i][0]==1:
        for j in range(i,m):
            if a[i][1]==a[j][0] and a[j][1]==n:
                cc=1
                break
    if cc==1:
        break
print("POSSIBLE" if cc==1 else "IMPOSSIBLE")