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// 848. Shifting Letters
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var shiftingLetters = function (s, shifts) {
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  let res = "",
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    i = shifts.length;
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  shifts.push(0);
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  while (--i >= 0) {
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    shifts[i] += shifts[i + 1];
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    res =
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      String.fromCharCode(((s.charCodeAt(i) - 97 + shifts[i]) % 26) + 97) + res;
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  }
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  return res;
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};