Number of Senior Citizens Problem

Number of Senior Citizens Problem — ExecCode Easy DSA Practice

Solve the Number of Senior Citizens problem on ExecCode. Free online easy DSA practice in Arrays - Logic Building. Write and run code in Java, C++, Python — no signup required to run.

Problem description

Description You are given a 0-indexed array of strings details. Your task is to - The last two characters determine the seat allotted to that person. Each element of details provides information about a given passenger compressed into a string of length 15. The system is such that: - The first ten characters consist of the phone number of passengers. - The next character denotes the gender of the person. Return the required answer exactly as shown in the examples.

Examples

Input {"details": ["7868190130M7522", "5303914400F9211", "9273338290F4010"]}; Output 2. Input {"details": ["1313579440F2036", "2921522980M5644"]}; Output 0

Constraints

1 <= details.length <= 100 details[i].length == 15 details[i] consists of digits from '0' to '9'. details[i][10] is either 'M' or 'F' or 'O'. The phone numbers and seat numbers of the passengers are distinct.

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