str1 = "función"
print(str1.islower())
str1 = "Mundo"
print(str1.islower())
str2 = "abcd1234"
print(str2.islower())
str3 = "!@m"
print(str3.islower())

print("--  upper\n")

a = "GDHUYE"

print(a.isupper())