CREATE TABLE table_55852 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

What is the lowest Grid for jj lehto with over 51 laps?
SELECT MIN("Grid") FROM table_55852 WHERE "Laps" > '51' AND "Driver" = 'jj lehto'
SELECT MIN("Grid") FROM "table_55852" WHERE "Driver" = 'jj lehto' AND "Laps" > '51'