java.lang.NumberFormatException: For input string: "23 "

I gave 23 (looks like a proper string) as input, but stil get NumberFormatException. Please point out where I went wrong. PS I was trying to solve "chef and strings problem" on codechef Relevent code: ``` Scanner cin=new Scanner(System.in); cin.useDelimiter("\n"); String data=cin.next(); System.out.println(data); /* * @param Q no. of chef's requests */ String tempStr=cin.next(); System.out.println(tempStr);; int Q = Integer.parseInt(tempStr); ``` Output: ``` sdfgsdg sdfgsdg 23 23 Exception in thread "main" java.lang.NumberFormatException: For input string: "23 " at java.lang.NumberFormatException.forInputString(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at Chef.RegexTestHarness.main(RegexTestHarness.java:24) ``` Complete program: ``` package Chef; // //TODO codechef constraints import java.util.Scanner; import java.lang.*; import java.io.*; //TODO RETURN TYPE class RegexTestHarness { public static void main(String args[]) { Scanner cin=new Scanner(System.in); cin.useDelimiter("\n"); String data=cin.next(); System.out.println(data); /* * @param Q no. of chef's requests */ String tempStr=cin.next(); System.out.println(tempStr);; int Q = Integer.parseInt(tempStr); for(int i=0; i<Q; i++) { /* * @param s chef's request */ String s= cin.next();//request //void getParam() (returning multiple parameters problem) //{a b L R //where a:start letter //b: end lettert //L: minStartIndex //L<=S[i]<=E[i]<=R //R is the maxEndIndex //TODO transfer to main char a=s.charAt(0); char b=s.charAt(3); int L=0, R=0; /* * @param indexOfR in the request string s, we separate R (which is maxEndIndex of chef's * good string inside data string) * . To do that, we first need the index of R itself in request string s */ int indexOfR= s.indexOf(" ", 5) +1; System.out.println("indexOfR is:" + s.indexOf(" ", 5)); L= Integer.parseInt( s.substring(5, indexOfR - 2) ); //TODO check if R,L<10^6 R=Integer.parseInt( s.substring(indexOfR) ); //} ( end getparam() ) //----------------------------------- //now we have a b L R //String good=""; //TODO add other constraints (like L<si.....) here if(a !=b) { int startInd=data.indexOf(a, L), endInd=data.lastIndexOf(b, R); int output=0, temp; while((startInd<endInd)&&(startInd != (-1) ) && ( endInd != (-1) )) { temp = endInd; while((startInd<endInd)) { //good= good+ s.substring(startInd, endInd); output++; endInd=data.lastIndexOf(b, endInd); } startInd=data.indexOf(a, startInd); //TODO if i comment the line below, eclipse says tat the variable temp //(declared at line 68) is not used. Whereas it is used at 68 //(and 83, the line below) endInd=temp; } System.out.println(output); } }//end for cin.close(); } } ```