169. Merge Strings Alternately

You are given two strings word1 and word2. Merge them by adding letters in alternating order, starting with word1. If a string is longer than the other, append the additional letters to the end.

Return the merged string.

Input: Two comma-separated strings: word1 and word2.

Output: A single merged string.

Examples

Input: abc,pqr
Output: apbqcr
Explanation: a+p, b+q, c+r → 'apbqcr'.

Input: ab,pqrs
Output: apbqrs
Explanation: a+p, b+q, then 'rs' appended → 'apbqrs'.

Input: abcd,pq
Output: apbqcd
Explanation: a+p, b+q, then 'cd' appended → 'apbqcd'.

Constraints

• 1 <= word1.length, word2.length <= 100
• word1 and word2 consist of lowercase English letters

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