let () =
  let soi n = if n < 10 then "0" ^ string_of_int n else string_of_int n in
  let small = [4; 6; 9; 11] in
  let big = [1; 3; 5; 7; 8; 10; 12] in
  let uru y = if y mod 400 = 0 then true else if y mod 100 = 0 then false else if y mod 4 = 0 then true else false in
  Scanf.scanf "%d/%d/%d\n" @@ fun y m d ->
  let (yy,mm,dd) =
    let d' = d + 2 in
    if d' <= 28 || (d' <= 30 && List.mem m small) || (d' <= 31 && List.mem m big) || (uru y && m = 2 && d' <= 29) then (y,(soi m),(soi d'))
    else if m = 12 && 30 <= d' then ((y+1), (soi 1), (soi (d' mod 31))) 
    else
      (if List.mem m small then (y,(soi (m+1)),(soi (d' mod 30)))
       else if List.mem m big then (y,(soi (m+1)),(soi (d' mod 31)))
       else if uru y then (y,(soi (m+1)),(soi (d' mod 29)))
       else (y,(soi (m+1)),(soi (d' mod 28)))) in
  Printf.printf "%d/%s/%s\n" yy mm dd