Can an expert please help create a matlab code to answer this question, will upvote correct output answer;

The following ciphertext was the output of a shift cipher:

lcllewljazlnnzmvyiylhrmhza

By performing a frequency count, guess the key used in the cipher. Use the computer to test your hypothesis. What is the decrypted plaintext? $($The ciphertext is stored in the downloadable computer files $($bit$.1\frac{y}{2}JbcS6p)$ under the name lcll$.)$