Change Minimum Characters to Satisfy One of Three Conditions LeetCode solution in Java

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class Solution {
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  public int minCharacters(String a, String b) {
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    int[] aCount = new int[26];
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    int aMax = 0;
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    for (int i = 0; i < a.length(); i++) {
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      aCount[a.charAt(i) - 'a']++;
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      aMax = Math.max(aMax, aCount[a.charAt(i) - 'a']);
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    }
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    int[] bCount = new int[26];
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    int bMax = 0;
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    for (int i = 0; i < b.length(); i++) {
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      bCount[b.charAt(i) - 'a']++;
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      bMax = Math.max(bMax, bCount[b.charAt(i) - 'a']);
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    }
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    int condition3 = a.length() - aMax + b.length() - bMax;
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    int globalMin = condition3;
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    int aTillCurrent = 0;
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    int bTillCurrent = 0;
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    for (int i = 0; i < 25; i++) {
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      aTillCurrent += aCount[i];
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      bTillCurrent += bCount[i];
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      globalMin = Math.min(globalMin, bTillCurrent + a.length() - aTillCurrent);
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      globalMin = Math.min(globalMin, aTillCurrent + b.length() - bTillCurrent);
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    }
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    return globalMin;
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  }
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}