UVA - 10093 - An Easy Problem!

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws IOException{
       
        InputStreamReader isr=new InputStreamReader(System.in);
        BufferedReader br=new BufferedReader(isr);
        StringBuffer sb = new StringBuffer("");
        String m="";
       
        while((m=br.readLine())!=null){
            int temp=minBase(m);
            long sum=sum(m);
            if(temp==1){
                sb.append(2).append("\n");
            }
            else{
                boolean flag=false;
                while(!flag && temp<63){
                    if(sum%(temp-1)==0){
                        flag=true;
                        break;
                    }
                    temp++;
                }
                if(flag)
                    sb.append(temp).append("\n");
                else
                    sb.append("such number is impossible!").append("\n");
            }
        }
        System.out.print(sb);
    }
   
        static int minBase(String temp) {
        int max=-1;
            for(int i=0;i<temp.length();i++){
                if(temp.charAt(i)>='A' && temp.charAt(i)<='Z' ){
                    if(max<temp.charAt(i)-'A'+10)
                        max=temp.charAt(i)-'A'+10;
                }
                else if(temp.charAt(i)>='a' && temp.charAt(i)<='z' ){
                    if(max<temp.charAt(i)-'a'+36)
                        max=temp.charAt(i)-'a'+36;
                }
                else if(temp.charAt(i)>='0' && temp.charAt(i)<='9' ){
                    if(max<temp.charAt(i)-'0')
                        max=temp.charAt(i)-'0';
                }
            }
        return max+1;
    }
       
       static long sum(String temp) {
        long sum=0;
            for(int i=0;i<temp.length();i++){
                if(temp.charAt(i)>='A' && temp.charAt(i)<='Z' ){
                    sum+=temp.charAt(i)-'A'+10;
                }
                else if(temp.charAt(i)>='a' && temp.charAt(i)<='z' ){
                    sum+=temp.charAt(i)-'a'+36;
                }
                else if(temp.charAt(i)>='0' && temp.charAt(i)<='9' ){
                    sum+=temp.charAt(i)-'0';
                }
            }
        return sum;
    }
    
}