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## Problem Description

Benson has *S* school uniforms to wear, but has to use them over *N* days. He doesn't like having to wear a school uniform that has not be washed since it was last used. Thus, he has made a plan on how he should manage his school uniforms.

On every day, he does one of 2 things to his uniforms:

1. He uses one. This is represented by a *USE* input. He will always use a school uniform that has been washed after the last use.

2. He washes all his school uniforms. This is represented by a *WASH* input. All used school uniforms will be washed and can be used again.

Help Benson check whether his plan is feasible or not.

## Input

The first line of input will contain two integers *S* and *N*.

The next N lines will contain a single string on each line, either *USE* or *WASH*.

## Output

Output either "CLEAN"(without quotes) if he never has to use an unwashed used shirt or "DIRTY"(without quotes) if he has to eventually use an unwashed used shirt.

## Limits

Subtask 1 (100%): 1 ≤ *S*, *N* ≤ 100

Subtask 2 (0%): Sample Testcases

## Sample Testcase 1

### Input

3 5 USE USE WASH USE WASH

### Output

CLEAN

## Sample Output 1 Explanation

Number the 3 uniforms 1, 2 and 3. Benson can use uniform 1 on the first day and uniform 2 on the second day. On the third day uniforms 1 and 2 are washed. On the fourth day he can use any uniform as they are all clean. Hence he does not ever need to use an unwashed used shirt.

## Sample Testcase 2

### Input

1 5 USE USE WASH USE WASH

### Output

DIRTY

## Sample Output 2 Explanation

Benson has only 1 uniform. After using his only uniform on the first day, he has no choice but to use the same (unwashed and used) uniform on the second day.

### Tags

### Subtasks and Limits

Subtask | Score | #TC | Time | Memory | Scoring |
---|---|---|---|---|---|

1 | 100 | 19 | 1s | 32MB | Minimum |

2 | 0 | 2 | 1s | 32MB | Minimum |

### Judge Compile Command

g++-8 ans.cpp -o washing -Wall -Wshadow -static -O2 -lm -m64 -s -w -std=gnu++17 -fmax-errors=512