/**

* The Really Neato Calculator Company, Inc. has recently hired your team to help design their Super

* Neato Model I calculator. As a computer scientist you suggested to the company that it would be neato

* if this new calculator could convert among number bases. The company thought this was a stupendous

* idea and has asked your team to come up with the prototype program for doing base conversion. The

* project manager of the Super Neato Model I calculator has informed you that the calculator will have

* the following neato features:

* • It will have a 7-digit display.

* • Its buttons will include the capital letters A through F in addition to the digits 0 through 9.

* • It will support bases 2 through 16.

* Input

* The input for your prototype program will consist of one base conversion per line. There will be three

* numbers per line. The first number will be the number in the base you are converting from. It may have

* leading ‘0’s. The second number is the base you are converting from. The third number is the base you

* are converting to. There will be one or more blanks surrounding (on either side of) the numbers. There

* are several lines of input and your program should continue to read until the end of file is reached.

* Output

* The output will only be the converted number as it would appear on the display of the calculator.

* The number should be right justified in the 7-digit display. If the number is to large to appear on the

* display, then print ‘ERROR’ (without the quotes) right justified in the display.

* Sample Input

* 1111000 2 10

* 1111000 2 16

* 2102101 3 10

* 2102101 3 15

* 12312 4 2

* 1A 15 2

* ABCD 16 15

* 03 13 10

* Sample Output

* 120

* 78

* 1765

* 7CA

* ERROR

* 11001

* D071

* 3

*/

//https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&category=&problem=325

import java.math.BigInteger;

import java.util.Scanner;

public class BasicallySpeaking {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

while (input.hasNext()) {

String numberAsString = input.next();

int fromBase = input.nextInt();

int toBase = input.nextInt();

BigInteger number = new BigInteger(numberAsString, fromBase);

String numberThatIsPrinted = number.toString(toBase);

String answer = numberThatIsPrinted.toUpperCase();

if (numberThatIsPrinted.length() > 7) {

answer = "ERROR";

}

System.out.printf("%7s\n", answer);

}

}

}