NumberFormatException while reading input in java

Why am I getting runtime exception while reading characters by using read() method and on next line using readLine() method of buffered reader? What can I do to avoid this? Referring problem.

For input in Java try using the custom input classes made by @EgorK . These classes are error free and probably the best known for I/O in Java. Take a look at the sample code here.

@vermashubhang I am using custom input classes only, still getting NZEC. My code runs perfectly in my machine and also on , here is the solution for the problem

You can’t share your solution of the ongoing contest as per the rules.

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I understood the error in my code. I was not beware of this.