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=int(input())
right=[]
for a in range(y+1,9999):
    A=list(str(a))
    if A.count(A[0])==1 and A.count(A[1])==1 and A.count(A[2])==1 and A.count(A[3])==1:
        right.append(a)
print(min(right))