PROGRAMMING:Judging triangle

###Task description
Yu Long encountered many sets of triangle side length data. According to the three side length values, it is difficult to distinguish the shape of the triangle with the naked eye. So he wanted to program and judge.
###Input format:
In a row, three positive integers are separated by spaces, representing three side lengths a, B and C respectively.
###Output format:
Cannot form triangle, output: not triangle
Equilateral triangle output: equilateral triangle
Isosceles triangle output: isosceles triangle
Right angled triangle output
General triangle output
###Input example:
```in
3 4 5
```
###Output example:
```out
Right-angled triangle
```
###Input example:
```in
4 5 16
```
###Output example:
```out
Not triangle
```







answer：If there is no answer, please comment