CREATE TABLE table_204_278 (id DECIMAL, "name of president" TEXT, "picture" TEXT, "life span" TEXT, "year of presidency" TEXT, "place of conference" TEXT)

who was the last president to serve consecutive years ?
SELECT "name of president" FROM table_204_278 WHERE "year of presidency" - "year of presidency" >= 1 ORDER BY "year of presidency" DESC LIMIT 1
SELECT "name of president" FROM "table_204_278" WHERE "year of presidency" - "year of presidency" >= 1 ORDER BY "year of presidency" DESC NULLS LAST LIMIT 1