Eight friends A, B, C, D, E, F, G and H have to deliver lectures on either the 6 or 17 of four different months among January, March, April and July but not necessarily in the same order. Not more than 2 persons will give a lecture in a month. Only one person will deliver a lecture each day. A delivers his lecture on the 6 of a month which has only 31 days but not in the month of March. E delivers the lecture immediately after B. Only three lectures were delivered between A and B. Only two persons give lectures between F and C and C is not the last one. The number of persons who give the lecture after E is the same as the number of persons who give the lecture before F. G and C give their lectures in the same month. D gives the lecture before H. Who deliver the lecture on 17th April?