Simple String Encryption

Given a string, transform it into a sequence of alphanumeric codes using a simple encryption scheme. For every alphabetical character in the input, convert it into its position in the alphabet (i.e. for any letter \( c \), the corresponding code is computed as \( code = \text{ord}(c) - \text{ord}('A') + 1 \)). Digits are retained as they are. All other characters should be ignored. The resulting codes must be joined together with underscores (_). Note that letter conversion is case-insensitive.

inputFormat

The input consists of a single line containing the string to be encrypted. The string may include letters, digits, and other characters.

outputFormat

Output a single line representing the encrypted string as described. The alphabetical characters in the string are replaced by their corresponding positions in the alphabet and separated by underscores (_), while digits are kept as is and non-alphanumeric characters are ignored.

hello

8_5_12_12_15