Alternating String Merge

Merge two lowercase strings by alternating characters from each string, then append the remaining suffix of the longer string. Requirements Input line 1 is strA. Input line 2 is strB. Append alternating characters from strA and strB into a new string. Once one string is exhausted, append all remaining characters from the other string. Constraint shown: 1 <= length(strA), length(strB) <= 25000. Inputs contain no special characters or uppercase letters. Examples Input: ab zsd Output: azbsd Explanation: alternate to form azbs, then append remaining d. Notes This is straightforward but output formatting is exact: print the merged string only.