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=input()
Y=int(y)+1
y=list(str(Y))
a,b,c,d=y[0],y[1],y[2],y[3]
while True:
    if a!=b and a!=c and a!=d and b!=c and b!=d and c!=d:
        break
    else:
        Y+=1
        y=list(str(Y))
        a,b,c,d=y[0],y[1],y[2],y[3]
print(Y)


