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())
if(1000<=n<=9000):
    t=str(n)
    count=1
    while(count!=0):
        
        if( t[0]!=t[1] and t[0]!=t[2] and t[0]!=t[3] and t[1]!=t[2] and t[1]!=t[3] and t[2]!=t[3]):
            print(t)
            count=0
        else:
            n=n+1
            t=str(n)