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String s1="10,1203,0524,2257";
String s2="29,1020,1350,3365";
long l1=Long.parseLong(s1.replaceAll(",", ""));
long l2=Long.parseLong(s2.replaceAll(",", ""));
String s3=String.valueOf(l1*l2);
String s4="";
for (int i=s3.length();i>=0;i=i-4){
if (i-4>0){
s4=s3.substring(i-4,i)+","+s4;
}else{
s4=s3.substring(0,i)+","+s4;
}
}
if (s4.endsWith(",")){
s4=s4.substring(0, s4.length()-1);
}
System.out.println(s4);