# 7. Write a program that uses exactly four for loops to print the sequence of letters below
# AAAAAAAAAABBBBBBBCDCDCDCDEFFFFFFG

for i in range(10):
    print('A', end='')
for j in range(7):
    print('B', end='')
for k in range(4):
    print('CD', end='')
print('E', end='')
for l in range(6):
    print('F', end='')
print('G')
