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 unique(n) :
    mp = {}
    while(n) :
        dig = n % 10
        if(dig in mp) :
            return False
        else :
            mp[dig] = True
        n //= 10

    return True

def solve() :
    s = int(input().strip())
    flag = True
    while(flag) :
        
        s += 1
        if(unique(s)) :
            print('s : ', s)
            print(s)
            flag = False
        

    return -1
     

solve()
