Walk Alone's Base-26 Addition

Walk Alone is a master of strings. In his eyes, every string represents a number in base-26. Specifically, the uppercase letters from A to Z correspond to the digits 0 to 25, respectively. For example, the string BA represents the number $$1\times26+0=26$$ in decimal, and BB represents $$1\times26+1=27$$.

You are given two strings s and t, each consisting of exactly one uppercase letter. Your task is to compute the sum of their corresponding base-26 values and output the result as a string in the same format. Note that although each input string is a single letter, the result may consist of more than one letter.

For example:

• A + A = A because $$0+0=0$$.
• B + C = D because $$1+2=3$$.
• Z + Z = BY because $$25+25=50$$ and $$50=1\times26+24$$, corresponding to B and Y respectively.

inputFormat

The input consists of two lines. The first line contains the string s and the second line contains the string t, each being a single uppercase letter.

outputFormat

Output a single string representing the sum of the corresponding base-26 numbers of s and t.

sample

A
A

A