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.
s = input()
n = int(s)
ans = 0
for i in range(n+1,9001):
    d = {}
    for j in str(i):
        d[j] = d.get(j,0)+1
    if len(d) == 4:
        ans = i    
        break
print(ans)