let input = gets().split(' ');
let specialCharacters = [];

// Removing all letters, whitespaces and numbers from each word of the input
input.forEach(element => {
    let specialWord = element.replace(/[0-9a-zA-Z .]/g, "");
    specialCharacters.push(specialWord);
});

// Removing the empty strings (if any) from the specialCharacters array
let filteredSpecialCharacters = specialCharacters.filter(function(e){return e});

// Finding the longest word from te specialCharacters array
let longestSymbols = Math.max(...(specialCharacters.map(el => el.length)));

print(longestSymbols);