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.
def same(num):
    arr  = []
    vrdct = False
    for i in str(num):
        if i not in arr:
            arr.append(i)
        else:
            vrdct = True
            break
    return vrdct
    
year = int(input())
while True:
    year+=1
    if not same(year):
        break
print(year