Number of Different Integers in a String LeetCode solution in C++

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class Solution {
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 public:
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  int numDifferentIntegers(string word) {
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    unordered_map<string, int> hmap;
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    for (int i = 0; i < word.size(); i++) {
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      if (isdigit(word[i])) {
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        string str;
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        while (word[i] == '0') i++;
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        while (isdigit(word[i])) str += word[i++];
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        hmap[str]++;
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      }
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    }
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    return hmap.size();
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  }
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};