Hi everyone, excuse me about my bad english but it isn't my natural language.

I have tried so much but I canīt solve the next problem:

Let $\displaystyle K $ be a closed orientable surface. Let $\displaystyle \alpha \subset K $ a loop such that $\displaystyle K - \alpha $ is connected. Show that $\displaystyle \alpha$ is retract of $\displaystyle K$.

I would like to know how to solve this.I hope sombody could help me. Thanks anyway.