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class Solution {
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  public String reformatDate(String date) {
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    int len = date.length();
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    String[] monthArray = {
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      "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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    };
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    String year = date.substring(len - 4);
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    int month = Arrays.asList(monthArray).indexOf(date.substring(len - 8, len - 5)) + 1;
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    String day = date.substring(0, len - 11);
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    StringBuffer sb = new StringBuffer();
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    sb.append(year + "-");
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    if (month < 10) sb.append("0" + month + "-");
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    else sb.append(month + "-");
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    if (day.length() == 1) sb.append("0" + day);
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    else sb.append(day);
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    return sb.toString();
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  }
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}