The director of the plant, reviewing a list of phone numbers and surnames of his employees, noticed a certain relationship between the surnames and phone numbers. Here are some surnames and phone numbers from the list:

| Achinsky | 8111 |
| :--- | :--- |
| Butenko | 7216 |
| Galich | 5425 |
| Lapina | 6131 |
| Martyanov | 9143 |
| Romidze | 7186 |

What is the phone number of the employee with the surname Ognev?
Think about what the first digit of the phone number might mean? What two numbers are derived from the remaining three digits?

## Solution

The first digit of the phone number is equal to the number of letters in the surname, and the three remaining digits are the alphabetical positions of the first and last letters of the surname. Therefore, Ogniev's phone number is 5163.

## Answer

5163.