Merge Strings Alternately LeetCode solution in Python

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# Runtime: 7 ms (Top 98.2%) | Memory: 13.31 MB (Top 45.5%)
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class Solution(object):
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    def mergeAlternately(self, word1, word2):
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        i = 0
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        j = 0
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        st = []
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        while i < len(word1) and j < len(word2):
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            st.append(word1[i])
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            st.append(word2[j])
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            i += 1
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            j += 1
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        while j < len(word2):
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            st.append(word2[j])
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            j += 1
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        while i < len(word1):
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            st.append(word1[i])
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            i += 1
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        return "".join(st)