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 = int(input())  # Read the input year

while True:
    y += 1  # Increment the year by 1
    year_str = str(y)  # Convert the year to a string
    if len(set(year_str)) == len(year_str):
        # If all digits are distinct, break the loop
        break

print(y)  # Print the minimum year with distinct digits

			 		  		 		   									 		  	