Problem:
Score : 100 points

Problem Statement

On some day in January 2018, Takaki is writing a document. The document has a column where the current date is written in yyyy/mm/dd format. For example, January 23, 2018 should be written as 2018/01/23.

After finishing the document, she noticed that she had mistakenly wrote 2017 at the beginning of the date column. Write a program that, when the string that Takaki wrote in the date column, S, is given as input, modifies the first four characters in S to 2018 and prints it.

Constraints

S is a string of length 10.

The first eight characters in S are 2017/01/.

The last two characters in S are digits and represent an integer between 1 and 31 (inclusive).

Input

Input is given from Standard Input in the following format:

S

Output

Replace the first four characters in S with 2018 and print it.

Sample Input 1

2017/01/07

Sample Output 1

2018/01/07

Sample Input 2

2017/01/31

Sample Output 2

2018/01/31

Solution in C (GCC 5.4.1) (judge verdict: Wrong Answer)

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

#define rep(n, i) for(int i = 0; i < n; i++)
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) < (b) ? (a) : (b))

void solve(void){
    int n;
    unsigned long y;
    int ans[3] = {-1, -1, -1};
    scanf("%d %ld\n", &n, &y);
    if (10000 * n > y) {
        for (int i = n; i >= 0; i--) {
            if (i * 10000 > y) continue;
            for (int j = n-i; j >= 0; j--) {
                if (i * 10000 + j * 5000 > y) continue;
                if (i * 10000 + j * 5000 + (n-i-j) * 1000 == y) {
                    ans[0] = i; ans[1] = j; ans[2] = n-i-j;
                }
            }
        }
    }

  printf("%d %d %d\n", ans[0], ans[1], ans[2]);
}

int main(void){
  solve();
  return 0;
}