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())+1
def solve(n):
    for i in range(4):
        for j in range(i+1,4):
            if n[i]==n[j]:return True
    return False
 
 
while 1:
    if solve(str(n)):
        n+=1
    else:
        print(n)
        break
 