#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) begin(v),end(v)
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using pii = pair<int, int>;
constexpr ll INF = 1ll<<30;
constexpr ll longINF = 1ll<<60;
constexpr ll MOD = 1000000007;
constexpr bool debug = false;
//---------------------------------//

int main() {
	int y, m, d;
	scanf("%d/%d/%d", &y, &m, &d);
	auto isleap = [](int y) {
		if (y % 4 != 0) return false;
		if (y % 400 == 0) return true;
		if (y % 100 == 0) return false;
		return true;
	};
	auto add = [isleap](int & y, int & m, int & d) {
		if (d == 31 || (d == 30 && (m == 4 || m == 6 || m == 9 || m == 11))) { ++m; d = 1; }
		else if (m == 2) {
			if (d == 29) { ++m; d = 1; }
			else if (d == 28) {
				if (isleap(y)) ++d;
				else { ++m; d = 1; }
			}
			else ++d;
		}
		else ++d;
		if (m == 13) { ++y; m = 1; }
	};
	REP(i, 2) add(y, m, d);
	printf("%04d/%02d/%02d\n", y, m, d);
}