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.
#Представте себя в яблонинивем саду лежашем на траве, слева обдувает прохладный ветерок, а ты в ожидании своего нового вертолёта# 
n=int(input())+1
x=n
k=0
while k==0:
    n=x
    x=x+1
    b=[]
    while n>0:
        b.append(n%10)
        n=(n-n%10)//10
    if len(set(b))==4:    
        k=k+1
        break
print(x-1)   
       