PROGRAMMING:Print the "99" formula table
The following is a complete table of the bottom triangle 99 formula:
```
1*1=1
1*2=2 2*2=4
1*3=3 2*3=6 3*3=9
1*4=4 2*4=8 3*4=12 4*4=16
1*5=5 2*5=10 3*5=15 4*5=20 5*5=25
1*6=6 2*6=12 3*6=18 4*6=24 5*6=30 6*6=36
1*7=7 2*7=14 3*7=21 4*7=28 5*7=35 6*7=42 7*7=49
1*8=8 2*8=16 3*8=24 4*8=32 5*8=40 6*8=48 7*8=56 8*8=64
1*9=9 2*9=18 3*9=27 4*9=36 5*9=45 6*9=54 7*9=63 8*9=72 9*9=81
```
This problem requires any given positive integer 'n', output from '1 * 1' to 'n * n' part of the formula table.
###Input format:
Enter to give a positive integer 'n' on a line (1 $$\ Le $$` n '$$$Le $$9).
###Output format:
Output the "n * n" part of the pithy formula table in the lower triangle, in which the right number of the equal sign occupies 4 digits and is left aligned.
###Input example:
```in
four
```
###Output example:
```out
1*1=1
1*2=2 2*2=4
1*3=3 2*3=6 3*3=9
1*4=4 2*4=8 3*4=12 4*4=16
```
answer：If there is no answer, please comment
```
1*1=1
1*2=2 2*2=4
1*3=3 2*3=6 3*3=9
1*4=4 2*4=8 3*4=12 4*4=16
1*5=5 2*5=10 3*5=15 4*5=20 5*5=25
1*6=6 2*6=12 3*6=18 4*6=24 5*6=30 6*6=36
1*7=7 2*7=14 3*7=21 4*7=28 5*7=35 6*7=42 7*7=49
1*8=8 2*8=16 3*8=24 4*8=32 5*8=40 6*8=48 7*8=56 8*8=64
1*9=9 2*9=18 3*9=27 4*9=36 5*9=45 6*9=54 7*9=63 8*9=72 9*9=81
```
This problem requires any given positive integer 'n', output from '1 * 1' to 'n * n' part of the formula table.
###Input format:
Enter to give a positive integer 'n' on a line (1 $$\ Le $$` n '$$$Le $$9).
###Output format:
Output the "n * n" part of the pithy formula table in the lower triangle, in which the right number of the equal sign occupies 4 digits and is left aligned.
###Input example:
```in
four
```
###Output example:
```out
1*1=1
1*2=2 2*2=4
1*3=3 2*3=6 3*3=9
1*4=4 2*4=8 3*4=12 4*4=16
```
answer：If there is no answer, please comment