PROGRAMMING:Nested loop format output

Input an N and output the figure in the following format, with 4 spaces after each number
```
0
0 1
0 1 2
0 1 2 3
.......
0 1 2 ..... n-1
```
###Input format:
Enter an integer n
###Output format:
Output data in the following format:
```
0
0 1
0 1 2
0 1 2 3
.......
0 1 2 ..... n-1
```
###Input example:
Here is a set of inputs. For example:
```in
five
```
###Output example:
The corresponding output is given here. For example:
```out
0
0 1
0 1 2
0 1 2 3
0 1 2 3 4
```







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