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()) + 1

while True:
    l = []
    for i in str(y):
        if i not in l:
            l.append(i)
        else:
            break
        
    if len(l) == 4:
        break
    
    y += 1

print("".join(l))
