Canadian Computing Competition: 2018 Stage 1, Junior #1
Here at the Concerned Citizens of Commerce (CCC), we have noted that telemarketers like to use seven-digit phone numbers where the last four digits have three properties. Looking just at the last four digits, these properties are:
- the first of these four digits is an or ;
- the last digit is an or ;
- the second and third digits are the same.
For example, if the last four digits of the telephone number are
9008, these are
Write a program to decide if a telephone number is a telemarketer number or not, based on the last four digits. If the number is not a telemarketer number, we should answer the phone, and otherwise, we should ignore it.
The input will be lines where each line contains exactly one digit in the range from to .
ignore if the number matches the pattern for a telemarketer number; otherwise,
Sample Input 1
9 6 6 8
Sample Output 1
Explanation for Sample Output 1
The first digit is , the last digit is , and the second and third digit are both , so this is a telemarketer number.
Sample Input 2
5 6 6 8
Sample Output 2
Explanation for Sample Output 2
The first digit is , and so this is not a telemarketer number.