## Number of Senior Citizens solution leetcode

You are given a **0-indexed** array of strings `details`

. 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.
- The following two characters are used to indicate the age of the person.
- The last two characters determine the seat allotted to that person.

Return *the number of passengers who are strictly more than 60 years old.*

**Example 1:**

Input:details = ["7868190130M7522","5303914400F9211","9273338290F4010"]Output:2Explanation:The passengers at indices 0, 1, and 2 have ages 75, 92, and 40. Thus, there are 2 people who are over 60 years old.

**Example 2:**

Input:details = ["1313579440F2036","2921522980M5644"]Output:0Explanation:None of the passengers are older than 60.

**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.