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.
y = int(input())
active = True
while active:
    y += 1
    z = str(y)
    x = 0
    for i in range(4):
        for j in range(4):
            if i == j:
                pass
            else:
                if z[i] == z[j]:
                    x += 1
                else:
                    pass
    if x != 0:
        continue
    else:
        break
                
print(y)
