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class Solution {
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  public String replaceDigits(String s) {
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    char[] str = s.toCharArray();
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    for (int i = 0; i < str.length; i++) {
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      if (Character.isDigit(str[i])) {
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        str[i] = shift(str[i - 1], str[i]);
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      }
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    }
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    return String.valueOf(str);
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  }
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  char shift(char letter, char number) {
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    int a = Integer.parseInt(String.valueOf(number));
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    int asci = (int) letter;
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    char c = (char) (asci + a);
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    return c;
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  }
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}