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.
n = int(input())

while True:
    a = n//1000
    b = n//100%10
    c = n//10%10
    d = n%10

    n = n+1
    if a!=b and a!= c and a!= d and b!= c and b!= d and c!= d:
        break

print(n)
