import Foundation
let D = readLine()!.split(separator: "/").map{Int($0)!}
var y = D[0]
var m = D[1]
var d = D[2]
var mon = [31,28,31,30,31,30,31,31,30,31,30,31]
if y % 4 == 0{
    if y % 100 == 0 && y % 400 != 0{
        mon[1] -= 1
    }
    mon[1] += 1
}
d += 2
if d > mon[m - 1]{
    d %= mon[m - 1]
    m += 1
    if m > 12{
        m -= 12
        y += 1
    }
}
print(String(format: "%04d", y) + "/" + String(format: "%02d", m) + "/" + String(format: "%02d", d))