What is the highest ff when solo is 56?
CREATE TABLE "table1_26176081_29" (
  "name" text,
  "gp" real,
  "solo" real,
  "ast" real,
  "total" real,
  "tfl_yds" text,
  "no_yds" text,
  "br_up" real,
  "no_yds" text,
  "avg" text,
  "td" real,
  "long" real,
  "rcv_yds" text,
  "ff" real,
  "blkd_kick" real
);
SELECT MAX("ff") FROM "table1_26176081_29" WHERE "solo"=56;