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.
a = int(input())
a += 1
while True:
    temp = a
    num = [0] * 10
    while(temp > 0):
        t = temp % 10
        num[t] += 1
        temp //= 10
    for i in range(10):
        if num[i] > 1:
            break
    else:
        print(a)
        break
    a += 1