user: Question: What is the average rank for Group a athlete yanina karolchyk, and a result higher than 18?
Columns: ['Rank', 'Group', 'Athlete', 'Nationality', 'Result']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'A', 'Vita Pavlysh', 'Ukraine', 19.99]
SQL:

assistant: SELECT AVG("Rank") FROM "Table" WHERE "Group" = 'a' AND "Athlete" = 'yanina karolchyk' AND "Result" > 18.0;