```python
DB = int(input())
DY = int(input())
YB = int(input())
if DB<=(DY+YB) or DY<=(DB+YB) or (YB<=(DB+DY)):
print('error!')
if DB==DY and DB==YB and YB==DY:
print('等边三角形')
elif DB==DY or DB==YB or YB==DY:
print('等腰三角形')
```
by HEziyue @ 2021-10-17 23:32:54
```python
if DB==DY and DB==YB and YB==DY:
```
`elif`。
by MatrixGroup @ 2021-10-18 07:20:20