# Pattern Printing 2
# ASCII Value

# a
# b b
# c c c
# d d d d
# e e e e e
# f f f f f f
# g g g g g g g 


for row in range(7):
    for col in range(row + 1):
        print(chr(97 + row), end=" ")
    print()


# for row in range(7):
#     for col in range(row + 1):
#         print(chr(65 + row), end=" ")
#     print()