恰好两对
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题目描述
给你 个大写字母符号, 如果这些符号恰好是两对不同的符号, 则输出 Yes, 否则输出 No.
数据格式
输入格式
一行 个大写字母符号.
输出格式
如果这 个符号恰好是两对不同的符号, 则输出 Yes, 否则, 输出 No
样例
ABBA
Yes
NIUB
No
北辰OI模拟测试
- Status
- Done
- Rule
- IOI
- Problem
- 10
- Start at
- 2023-11-9 18:00
- End at
- 2023-11-9 20:00
- Duration
- 2 hour(s)
- Host
-
yuyongchao
- Partic.
- 2
