# File: strstuff.py
#
# Show how strings and string operations work
#
# Matt Bishop, MHI 289I, Fall 2023

#
# read in a string
#
mystr = input("Please type some text: ")
#
# print the string out letter by letter, in two different ways
#
print("First, we print each character in order:")
for i in range(len(mystr)):
    print("(" + str(i+1) + ")", mystr[i], end=' ')
print("\nHere's another way:")
index = 0
for i in mystr:
    print("(" + str(index+1) + ")", i, end=' ')
    index = index + 1
print("\n")
input("Type enter to continue> ")
print(" ") 
#
# same thing, but backwards
#
print("Next, we print each character in reverse order:") 
for i in range(len(mystr)):
    print("(" + str(i+1) + ")", mystr[-i-1], end=' ')
print("\n")
input("Type enter to continue> ")
print(" ") 
#
# now generate the reverse string
#
print("Now, let's reverse it as a string")
revmystr = ""
for i in range(len(mystr)):
    revmystr = revmystr + mystr[-i-1]
print("And it is: ", revmystr, end=' ')
#
# maybe it's a palindrome; let's check ...
#
if mystr == revmystr:
    print(" -- hey, it's a palindrome!", end=' ')
print("\n")
input("Type enter to continue> ")
print(" ") 
#
# let's count and list vowels
#
print("Let's count vowels: ", end=' ')
vowels = "aeiou"
vowelct = 0
vowellist = ""
for ch in mystr:
        if ch.lower() in vowels:
            vowelct = vowelct + 1
            vowellist = vowellist + ch.lower()
print("Out of", len(mystr), "characters, there are", vowelct, "vowels:", vowellist)
print("That's", "%.2f" % ((vowelct/len(mystr))*100.0), "percent of the characters")
print(" ")
input("Type enter to continue> ")
print(" ") 
#
# now make a pyramid or two by chopping letters off from the outside in
#
# first, big to little
#
print("Now let's look at some slices:")
print(mystr)
for i in range(len(mystr) // 2 + len(mystr) % 2):
    if i == 0:
        continue
    print(" "*(i-1), mystr[i:-i])
#
# last, little to big
#
for i in range(len(revmystr) //  2 + len(revmystr) % 2, 0, -1):
    if i == len(revmystr) // 2 + len(revmystr) % 2:
        continue
    print(" "*(i-1), revmystr[i:-i])
print(revmystr)