Tanya and Stairways

1005A800· newbie1s256 MB⌨ stdin/stdout

#implementation

Examples

Sample 1of 4

Input

7
1 2 3 1 2 3 4

Output

2
3 4

Sample 2of 4

Input

4
1 1 1 1

Output

4
1 1 1 1

Sample 3of 4

Input

5
1 2 3 4 5

Output

1
5

Sample 4of 4

Input

5
1 2 1 2 1

Output

3
2 2 1

1005A.cpp

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Ln 11·137 BGNU C++20 (64)