PROGRAMMING:upup
$$Bear$$_$$ 2 $$often has low self-esteem because he doesn't grow up, so he especially likes $$upup $. Now he wants you to help him find out how many $$upups are in the string $$s (1 < = | s | < = 10 ^ 3) $. For example, there are two of $$upup $$.
###Input format:
In one line, give a * * string $$s (1 < = | s | < = 10 ^ 3) $, which is only composed of lowercase letters * * $$u, p $$.
###Output format:
How many $$upups are output in one line.
###Input example:
```in
upupup
```
###Output example:
```out
two
```
###Tips:
20% data, $$1 < = n < = 10$$
60% of the data, $$1 < = n < = 10 ^ 2$$
100, $$1 < = n < = 10 ^ 3$$
answer：If there is no answer, please comment
###Input format:
In one line, give a * * string $$s (1 < = | s | < = 10 ^ 3) $, which is only composed of lowercase letters * * $$u, p $$.
###Output format:
How many $$upups are output in one line.
###Input example:
```in
upupup
```
###Output example:
```out
two
```
###Tips:
20% data, $$1 < = n < = 10$$
60% of the data, $$1 < = n < = 10 ^ 2$$
100, $$1 < = n < = 10 ^ 3$$
answer：If there is no answer, please comment