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.
t=str(input())
#while(
l=str(int(t)+1)
while(1):
    put=[]
    for i in str(int(l)):
        if i not in put:
            put.append(i)
        else:
            continue
    if len(put)<4:
        l=str(int(l)+1)
    else:
        break
print(l)
        




