count_first_letter({"Stark": ["Ned", "Robb", "Sansa"], "Snow" : ["Jon"], "Lannister": ["Jaime", "Cersei", "Tywin"]}) ➞ {"L": 3, "S": 4}

count_first_letter({"Stark": ["Ned", "Robb", "Sansa"], "Snow" : ["Jon"], "Sannister": ["Jaime", "Cersei", "Tywin"]}) ➞ {"S": 7}

count_first_letter({"Stark": ["Ned", "Robb", "Sansa"], "Snow" : ["Jon"], "Lannister": ["Jaime", "Cersei", "Tywin"],"Tion":["joun","sara"]}) ➞ {"L":3, "S":4, "T":2}

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