#!/usr/bin/env python
# coding: utf-8

# # เฉลยแบบฝึกหัดพิมพ์ตัวอักษรเรียงเป็นสามเหลี่ยมต่างๆ

# In[21]:


letter = "O"
rows = 10
for i in range(1, rows + 1):
    print(letter * i)


# In[24]:


letter = "O"
rows = 10
for i in range(rows, 0, -1):
    print(letter * i)


# In[17]:


letter = "O"
rows = 10
for i in range(1,rows + 1):
    print(" " * (rows-i) + letter * i)


# In[25]:


letter = "O"
rows = 10
for i in range(rows, 0, -1):
    print(" " * (rows-i) + letter * i)


# In[19]:


letter = "O"
rows = 10
for i in range(1,rows + 1):
    print(" " * (rows-i) + letter * i + letter * (i-1))


# In[26]:


letter = "O"
rows = 10
for i in range(rows, 0, -1):
    print(" " * (rows-i) + letter * i + letter * (i-1))


# In[ ]: