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())
sta=True
while sta:
    y+=1
    y=str(y)
    for i in range(3):
        for j in range(i+1,4):
            if y[i]==y[j]:
                sta=True
                break
            else:
                sta=False
        if sta==True:
            break
    y=int(y)
print(y)