PROGRAMMING:Xuemei invites DH to dinner

DH has completed the challenge, and his younger sister wants to invite him to qiaxian three kinds of food. However, when they get to the gate of qiaxian three kinds of food, they find that there is a long line there, but some people eat together. Now DH gets the God's eye given by lfq, so that he can see that those people are together (the people who eat together must be in the adjacent place), The witty and brave DH immediately formed a good line in his mind (that is, the people who come to eat together are regarded as a person and occupy a table), but he didn't say it and cried for Xuemei. Can you help Xuemei know the good line??
The queue is represented by lowercase letters
###Input format:
A string, the length of which is not more than 1000
###Output format:
Output the processed string
###Input example:
Here is a set of inputs. For example:
```in
abcccccdddddaaaaaeeeeessss
```
###Output example:
The corresponding output is given here. For example:
```out
abcdaes
```







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