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++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <iostream>
using namespace std;
int main(){
char s[10];
int a,x;
cin>>s;

a=int(s[8])-48;
x=int(s[9])-48;
	if(s[0]=='2'&&s[1]=='0'&&s[2]=='1'&&s[3]=='7'&&s[4]=='/'&&s[5]=='0'&&s[6]=='1'&&s[7]=='/'&&(a+x)>=1&&(a+x)<=31){
		s[3]='8';
		cout<<s<<endl;
}
	return 0;
}