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())

for y in range(n+1, 9050):
    
    y = str(y)
    if len({y[0], y[1], y[3], y[2]}) == 4:
        
        print(y)
        break
    
