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.
a=int(input(""))
a=a+1
b=str(a)
c=[]
d=[]
for i in b:
    c+=[i]
while 0<1:
    if c[0]!=c[1] and c[0]!=c[2] and c[0]!=c[3] and c[1]!=c[2] and c[1]!=c[3] and c[2]!=c[3]:
        print(c[0],end="")
        print(c[1],end="")
        print(c[2],end="")
        print(c[3],end="")
        break
    else:
        a+=1
        b=str(a)
        c=[]
        for i in b:
            c+=[i]         
