It seems like the year of 2013 came only yesterday. Do you know a curious fact? The year of 2013 is the first year after the old 1987 with only distinct digits.

Now you are suggested to solve the following problem: given a year number, find the minimum year number which is strictly larger than the given one and has only distinct digits.
The single line contains integer *y* (1000 ≤ *y* ≤ 9000) — the year number.
# 271A - Beautiful Year 
# https://codeforces.com/problemset/problem/271/A

# Inputs:
# 1) Año inicial
anio = int(input())

# Empieza a buscar a partir del próximo año
anio += 1

# Mientras el año no tenga 4 dígitos, suma 1 al año hasta encontrarlo
while(len(set(str(anio))) < 4):
    anio += 1

# Imprime el año con dígitos distintos
print(anio)