# Nested loops

Just like we can have nested conditions with several nested `if` and `else` statements, we can also have nested `for` and `while` loops.
We can iterate over time in a day by iterating over hours, minutes, and seconds:
``````for h in range(24):
for m in range(60):
for s in range(60):
print(f'Time: {h}:{m}:{s}')``````
The output of the program will be all the possible timestamps of the day as demonstrated on the right.
The for loop starts with `h = 0`, then uses `m = 0`, then iterates over all the seconds from 0 to 60, and prints the time.
Then, the program sets `m = 1` and iterates over all the seconds. Then it sets `m = 2`, and repeats this process until reaching `m = 59`. At this point, the program finishes the second loop and `h` becomes `1`. Then, the whole process of iterating over minutes and seconds for `h = 1` repeats again. `h` then becomes `2`, then `3`, and the cycle continues until `h` reaches `23`, `m` reaches `59` and `s` reaches `59`. That stops all the 3 loops together.
``````Time: 0:0:0
Time: 0:0:1
Time: 0:0:2
Time: 0:0:3
Time: 0:0:4
Time: 0:0:5
Time: 0:0:6
Time: 0:0:7
...
Time: 0:9:20
Time: 0:9:21
Time: 0:9:22
Time: 0:9:23
Time: 0:9:24
...
Time: 23:59:54
Time: 23:59:55
Time: 23:59:56
Time: 23:59:57
Time: 23:59:58
Time: 23:59:59``````
We can also print more fine-grained objects on the screen with nested loops:
``````for i in range(10):
for j in range(i + 1):
if j % 2 == 0:
print('*', end='')
else:
print('#', end='')
print()``````
``````*
*#
*#*
*#*#
*#*#*
*#*#*#
*#*#*#*
*#*#*#*#
*#*#*#*#*
*#*#*#*#*#``````
For each line `i`, we print with an inner loop of `j in range(i + 1)`. The symbol is determined based on the location.

#### Challenge

Inspired by 2D games, you would like to experiment with printing some shapes. You want to print a triangle of height `n` and width `n`, where for each location, the printed symbol will be `e` if the sum of its row and column is even and `o` if the sum is odd.
Note that rows and columns start counting from 1.
 Input Output 10 e oe eoe oeoe eoeoe oeoeoe eoeoeoe oeoeoeoe eoeoeoeoe oeoeoeoeoe

#### Constraints

Time limit: 2 seconds

Memory limit: 512 MB

Output limit: 1 MB