Description: Spreadsheet software (eg Excle, WPS forms, etc.) in all cell column number sequence is represented by the letters AZ (eg: A, B, C. .. Z, AA, AB ... AZ, BA, BB .. . AAA ...). Implement a function that, given an integer, print out the column number of letters (for example, a print out A)
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test1_Jinshan\.classpath
.............\.project
.............\.settings\org.eclipse.jdt.core.prefs
.............\bin\test1_Jinshan.class
.............\src\test1_Jinshan.java
.............\.settings
.............\bin
.............\src
test1_Jinshan