Katta va kichik harflar soni

Satr s berilgan. Undagi katta va kichik harflar sonini "upper=<katta harflar>, lower=<kichik harflar>" ko'rinishidagi satr sifatida qaytaring.

func solve(s string) string {
    // ...
}

Misollar

Input: S='Hello World'
Output: "upper=2, lower=8"

Input: S='ABC123xyz'
Output: "upper=3, lower=3"

Input: S='12345'
Output: "upper=0, lower=0"

Maslahatlar

1. Ikkita sanagich yuriting: upper va lower.
2. Katta harf: r >= 'A' && r <= 'Z'; kichik harf: r >= 'a' && r <= 'z'.