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.
y= (input())
for num in range(int(y)+1,9001):
    a = str(num)
    if (a[0] != a[1]):
        if(a[1]!=a[2]):
            if(a[2]!=a[3]):
                if (a[0]!=a[2]):
                    if (a[0] != a[3]):
                        if (a[1]!=a[3]):
                            print(num)
                            break            
                




        
