# Author:  James Tam
# Version: November, 2012

# Learning concepts: list operations (search and modify)

grades = ['A','B','C','A','B','C','A']
last = len(grades) - 1
i = 0
while (i <= last):
    if (grades[i] == 'A'):   # Search for matches
        grades[i] = 'A+'     # Modify element
    i = i + 1
print(grades)