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class Solution {
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  public String[] uncommonFromSentences(String s1, String s2) {
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    List<String> list = new LinkedList<>();
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    Map<String, Integer> map = new HashMap<>();
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    String[] arr1 = s1.split(" ");
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    String[] arr2 = s2.split(" ");
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    for (int i = 0; i < arr1.length; i++) {
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      map.put(arr1[i], map.getOrDefault(arr1[i], 0) + 1);
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    }
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    for (int i = 0; i < arr2.length; i++) {
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      map.put(arr2[i], map.getOrDefault(arr2[i], 0) + 1);
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    }
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    for (Map.Entry<String, Integer> entry : map.entrySet()) {
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      if (entry.getValue() == 1) list.add(entry.getKey());
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    }
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    String[] res = new String[list.size()];
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    for (int i = 0; i < res.length; i++) {
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      res[i] = list.get(i);
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    }
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    return res;
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  }
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}