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())
run=True
while(run):
    n+=1
    run=False
    for i in range(0,4):
        for j in range(0,4):
            if(str(n)[i]==str(n)[j] and i!=j):
                run=True
    if(not run):
        print(n)