This problem needs to be solved with a source code. I need a C++ program that will help me solve this question. I need it in C++ please not python or anything else.

1.2. We received the following ciphertext which was encoded with a shift cipher:

xultpaajcxitltlxaarpjhtiwtgxktghidhipxciwtvgtpilpit ghlxiwiwtxgqadds.

1. Perform an attack against the cipher based on a letter frequency count: How many letters do you have to identify through a frequency count to recover the key? What is the cleartext?