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.
num = input() 
y= [int(y) for y in num] 

while(num<9000):
    if y[0]!=y[1]!=y[2]!=y[3]!=:
        print(num)
        
        
    num++
