帮同学改的程序 @little_blue

原本自己早已经AC了，但现在越改越懵

n = int(input())
an = input()
f = 0
s1,s2,s3,s4,s5 = "","","","",""
for i in an:
    if i == "0":
        s1 += "XXX"
        s2 += "X.X"
        s3 += "X.X"
        s4 += "X.X"
        s5 += "XXX"
    elif i == "1":
        s1 += "..X"
        s2 += "..X"
        s3 += "..X"
        s4 += "..X"
        s5 += "..X"
    elif i == "2":
        s1 += "XXX"
        s2 += "..X"
        s3 += "XXX"
        s4 += "X.."
        s5 += "XXX"
    elif i == "3":
        s1 += "XXX"
        s2 += "..X"
        s3 += "XXX"
        s4 += "..X"
        s5 += "XXX"
    elif i == "4":
        s1 += "X.X"
        s2 += "X.X"
        s3 += "XXX"
        s4 += "..X"
        s5 += "..X"
    elif i == "5":
        s1 += "XXX"
        s2 += "X.."
        s3 += "XXX"
        s4 += "..X"
        s5 += "XXX"
    elif i == "6":
        s1 += "XXX"
        s2 += "X.."
        s3 += "XXX"
        s4 += "X.X"
        s5 += "XXX"
    elif i == "7":
        s1 += "XXX"
        s2 += "..X"
        s3 += "..X"
        s4 += "..X"
        s5 += "..X"
    elif i == "8":
        s1 += "XXX"
        s2 += "X.X"
        s3 += "XXX"
        s4 += "X.X"
        s5 += "XXX"
    elif i == "9":
        s1 += "XXX"
        s2 += "X.X"
        s3 += "XXX"
        s4 += "..X"
        s5 += "XXX"
    f += 1 #标记是否为最后一位
    if(f!=n):
        s1 += "."
        s2 += "."
        s3 += "."
        s4 += "."
        s5 += "."
print(s1);print(s2);print(s3);print(s4);print(s5)

输出和样例完全一样，但还是全WA了

求助qwq