Directions : This question consists of a sentence, parts of which have been jumbled. These parts have been labelled as P, Q, R and S. Given below each sentence are four sequences, namely (a), (b), (c) and (d). You are required to re-arrange the jumbled parts of the sentence and mark your response accordingly. 

of letters as the (P) / with the same number (Q) / 4 is the only number (R) / meaning of its name (S)