#include <ctype.h>
#include <stdio.h>
#include <string.h>
 
int main() {
    char input[256];
    const char* s = input;
    fgets(input, sizeof input / sizeof(char), stdin);
    //Пропускаем небуквенные символы в начале строки.
    while (*s && !isalpha(*s))
        s++;
    const char* result = s;
    double resultPart = .0;
    while (*s) {
        //Читаем слово.
        const char* wordStart = s;
        int vowelCount = 0, consonantCount = 0;
        while (*s && isalpha(*s)) {
            if (strchr("aeiouy", *s))
                vowelCount++;
            else
                consonantCount++;
            s++;
        }
        //Обновляем ответ.
        double part = (double)vowelCount / (vowelCount + consonantCount);
        if (part > resultPart) {
            resultPart = part;
            result = wordStart;
        }
        //Пропускаем небуквенные символы между словами.
        while (*s && !isalpha(*s))
            s++;
    }
    //Выводим найденное слово.
    while (*result && isalpha(*result))
        putchar(*result++);
    putchar('\n');
}
 

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This is a sample sentence.