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 distdigit(n):
    c=0
    a=[0]*10
    
    while(n):
        r=n%10
        a[r]=1
        n=n//10
    for i in a:
        if(i!=0):
            c+=1
    return c

def totaldigit(n):
    c=0
    while(n):
        c+=1
        n=n//10
    return c






def nextnum(n):
    while(n<=9000):
        a=distdigit(n+1)
        b=totaldigit(n+1)
        if(a == b):
            return n+1
        else:
            n+=1
        
n=int(input())
print(nextnum(n))