use std::io::{stdin, Read};

fn main() {
    let mut buf = String::new();
    stdin().read_to_string(&mut buf).unwrap();
    let mut tok = buf.split_whitespace();
    let mut get = || tok.next().unwrap();
    
    let mut s = get().split('/');
    let mut get = || s.next().unwrap();
    let mut y: i32 = get().parse().unwrap();
    let mut m: i32 = get().parse().unwrap();
    let mut d: i32 = get().parse().unwrap();
    
    d += 2;
    let next_d = match m {
    4|6|9|11 => 30,
    2 => if (y % 4 == 0 && y % 100 != 0) || y % 400 == 0 { 29 } else { 28 },
    _ => 31,
    };
    if d > next_d {
        d -= next_d;
        m += 1;
        if m > 12 {
            m = 1;
            y += 1;
        }
    }
    
    println!("{:4}/{:02}/{:02}", y, m, d);
}