So you're given a sentence where if there is a particular word in the sentence then the output is 1, if it is not there then the output is 0. For example:
Sentence = 'The birds in the field are eating bird seed'; Not_allowed = 'field'
so the output will be, because field is found in the sentence:
Output = 1;
Sentence = 'If the sky is blue on earth, what is the sky color on mars?'; Not_allowed = 'oven'
so the output will be, because oven is not found in the sentence:
Output = 0;
That is it!