import pypyjit
pypyjit.set_param("max_unroll_recursion=-1")
import sys
sys.setrecursionlimit(10**5+100)


S = input()
N = len(S)

ans = []
def f(n,giri):
    if(n == N):
        print("".join(ans))
        exit()

    if(not giri or int(S[n]) >= 5):
        ans.append("5")
        f(n+1,giri and S[n] == "5")
        ans.pop()

    if(not giri or int(S[n]) >= 4):
        ans.append("4")
        f(n+1,giri and S[n] == "4")

f(0,True)
f(1,False)