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.
n=int(input())
from bisect import *
years=[]
map=set()
def rec(s,l):
    if l==4:
        years.append(s)
        return
    for i in range(10):
        if i not in map:
            map.add(i)
            rec(s*10+i,l+1)
            map.remove(i)
rec(0,0)
years.sort()
# print(years[0],years[-1])
index=bisect_right(years,n)
print(years[index])
