#include<bits/stdc++.h>
using namespace std;

bool LeapYear(int64_t n) {
	if(n % 400== 0) return true;
	if(n % 100== 0) return false;
	if(n % 4 == 0) return true;
	return false;
}

void tomorrow(int& y, int& m, int& d) {
	const int day[] = {-1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
	++d;
	if(d > day[m]) {
		if((not LeapYear(y)) or (not (m == 2))) {
			d = 1;
			m++;
			if(m > 12) m = 1;
		} else {
			if(d > 29) {
				d = 1;
				m = 3;
			}
		}
	}
	if(m == 1 and d == 1) {
		y++;
	}
}

int main() {
	int y, m, d; char _;
	cin >> y >> _ >> m >> _ >> d;
	tomorrow(y, m, d);
	tomorrow(y, m, d);
	printf("%04d/%02d/%02d\n", y, m, d);
	return 0;
}