codepeng

A certain spreadsheet program labels the columns of a spreadsheet using letters. Column 1 is labeled as ``A", column 2 as ``B", ..., column 26 as ``Z". When the number of columns is greater than 26, another letter is used. For example, column 27 is ``AA", column 28 is ``AB" and column 52 is ``AZ". It follows that column 53 would be ``BA" and so on. Similarly, when column ``ZZ" is reached, the next column would be ``AAA", then ``AAB" and so on.

The rows in the spreadsheet are labeled using the row number. Rows start at 1.

The designation for a particular cell within the spreadsheet is created by combining the column label with the row label. For example, the upper-left most cell would be ``A1". The cell at column 55 row 23 would be ``BC23".

You will write a program that converts numeric row and column values into the spreadsheet designation.

Input consists of lines of the form: RnCm. n represents the row number [1,300000000] and m represents the column number, 1<=m<=300000000. The values n and m define a single cell on the spreadsheet. Input terminates with the line: R0C0 (that is, n and m are 0). There will be no leading zeroes or extra spaces in the input.

For each line of input (except the terminating line), you will print out the spreadsheet designation for the specified cell as described above.

R1C1
R3C1
R1C3
R299999999C26
R52C52
R53C17576
R53C17602
R0C0

A1
A3
C1
Z299999999
AZ52
YYZ53
YZZ53

Greater New York 2004

進制轉化問題，把列數改成26進制輸出，分別用A,B...Z代替1,2,3...這里base[0]='Z'，表示n與26余數為0時的取值，但進位問題需要注意，分余數是否為0兩種情況分析。
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