Bir qator va bitta belgi qabul qiladigan funksiya yaratish. Bu funksiya ikkinchi argument birinchi qatorda nechta marta uchrayotganini butun son sifatida qaytarishi kerak.
Agar uchrashlar topilmasa, 0 soni qaytarilishi kerak.
Misollar: ("Hello", 'o') --- 1
("Hello", 'l') --- 2
("", 'z') --- 0
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