# PROBLEM 1
#
# Assume s is a string of lower case characters.
# 
# Write a program that counts up the number of vowels contained in the string s. Valid vowels are: 'a', 'e', 'i', 'o', and 'u'. 
#

numVowels = 0

for char in s:
    if char == 'a' or char == 'e' or char == 'i' or char == 'o' or char =='u':
        numVowels+=1
print ("Number of vowels: " + str(numVowels))        

