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())
def lky(x):
    b=[]
    while x!=0:
        b.append(x%10)
        x//=10
    d=0
    for i in range(0,len(b)-1):
        for j in range(i+1,len(b)):
            if b[i]==b[j]:
                d+=1
    if d==0:
        return True
    else:
        return False
for i in range(y+1,9999):
    if lky(i)==True:
        print(i)
        break