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.
y=input()
m=0
for i in range (len(y)):
    if y=="1987":
     m=2013
    elif y[0]=="1":
     m=int(y)+23
    else:
     m=int(y)+1
print(m)