String manipulation loops

Question

for char in "1bc4":
    print(char)

How can I modify this loop so it considers each character in turn: if it is a letter, it should print it converted to upper case; otherwise, it should print "not a letter". I.e. it should produce the output:

not a letter
B
C
not a letter

Please help, thanks!

Answer 1

You need:

cha = "1bc4"
for c in cha:
    if c.isalpha():     
        print(c.upper())
    else:
        print("Not a letter")