import Foundation

let inputString = """
Э С Ф О Ю Ю Ю С О Ф
О Ю Ю С С С О Ф О
"""

var search = "Ю, Э, С, Ф, О"
search = search.replacingOccurrences(of: ", ", with: "")

var dict = [Character:Int]()
for char in search {
    dict[char] = 0
}

for i in inputString {
    if dict[i] != nil {
        dict[i] = (dict[i] ?? 0) + 1
    }}

dict