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())
while(n<9001):
    a = str(n+1)
    if a[0] == a[1] or a[0] == a[2] or a[0] == a[3] or a[2] == a[1] or a[3] == a[1] or a[3] == a[2]:
        n = n + 1
    else:
        break
    
print(n+1)