134. Alarming String

Codeforces

IDCF10269134

Time1000ms

Memory256MB

Difficulty—

English · Original

Formal · Original

You define a string to be an _alarming string_ if it contains exactly three "a" characters. Given a string, possibly containing spaces, figure out whether or not it is an alarming string. The only line of input contains a single string $s$, consisting of only lowercase characters. Output "YES" (no quotes) if the given string is an alarming string, as described above, and "NO" (no quotes) otherwise. ## Input The only line of input contains a single string $s$, consisting of only lowercase characters. ## Output Output "YES" (no quotes) if the given string is an alarming string, as described above, and "NO" (no quotes) otherwise. [samples]

**Definitions** Let $ s $ be a string over the alphabet $ \{a, b, \dots, z\} \cup \{\text{space}\} $. **Constraints** - $ s $ consists only of lowercase Latin letters and spaces. **Objective** Determine whether the number of occurrences of the character 'a' in $ s $ is exactly 3. That is, output "YES" if $ \#_{a}(s) = 3 $, otherwise output "NO".

API Response (JSON)

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