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.
year=int(input())

def unique_year(y):
    L=[]
    y_l=list(str(year))
    for i in y_l:
        if i not in L:
            L.append(i)
        else:
            return 0
    return 1
        
for i in range(9000):
    year+=1
    x=unique_year(year)
    if x==0 :
        continue
    else:
        break
print(year)
