What is the number of group b winner for francavilla?
CREATE TABLE "table1_1137142_1" (
  "season" text,
  "group_a_winner" text,
  "group_b_winner" text,
  "group_c_winner" text,
  "group_d_winner" text
);
SELECT COUNT("group_b_winner") FROM "table1_1137142_1" WHERE "group_c_winner"='Francavilla';