'''
for num in range(2):
    print("바깥쪽 반복문")
    for num in range(3):
        print("안쪽 반복문")
'''

'''
for num1 in range(0,4):
    print(f"안쪽 : {num1}")
    for num2 in range(0,num1):
        print(f"\t 바깥쪽 : {num2}")

    print("="*20)    
'''

'''
cnt = 0


for y in range(1,6):

    for x in range(1,6):
        cnt += 1

    print(cnt)    
'''

'''
for hour in range(1,13):

    for minute in range(1,61):
        print(f"{hour}시 {minute}분")
'''

'''
for day in range(1,8):
    print(f"{day}일차")
    for time in range(1,4):
        if time==1:
            print("아침",end = " ")
        if time==2:
            print("낮",end = " ")
        if time==3:
            print("밤",end = " ")
    print("")
'''

'''
for y in range(5):
    sentence = ""

    for x in range(5):
        sentence += str(y)

    print(sentence)    
'''

'''
for y in range(1,5):
    pyramid=""

    for x in range(y):
        pyramid += str(y)

    print(pyramid)
'''

'''
i = 1
txt = ''

while i<4:
    j = 1
    txt += f'{i}학년 '

    while j<6:
        txt += f'{j}반 '
        j += 1

    i += 1
    txt += '\n'
    
print(txt)
'''

'''
num = 10
cnt = 0

for y in range(1, num+1):
    for x in range(1, num+1):
        cnt += 1
        print(f"{cnt:3d}", end = " ")

    print()    
'''

'''
num = int(input("숫자를 입력해주세요 : "))

cnt = 0

for y in range(1, num+1):

    for x in range(1,y):
        cnt +=1
        print(cnt, end = " ")
    print()    
'''

'''
for y in range(5):
    for x in range(5):
        print(chr(ord('A') + x + y), end = " ")
    print()    
'''

'''
string = "abcd"

for y in range(len(string)):

    for x in range(y, len(string)):

        print(string[y:x+1])
'''


'''
number = 0

for y in range(6):
    for x in range(5):
        number += 10
        print(f"{number:<}\t",end="")

    print()    
'''


for y in range(5):
    
    for x in range(y+1):
        print(chr(ord('A') + x + y), end=" ")

    print()