#include <stdio.h>

#define MAX_LENGTH 52

int convert(char* c) {
    switch (*c) {
        case 'z':
            return (c[1] == 'e' && c[2] == 'r' && c[3] == 'o') ? 0 : -1;
        case 'o':
            return (c[1] == 'n' && c[2] == 'e') ? 1 : -1;
        case 't':
            if (c[1] == 'w' && c[2] == 'o')
                return 2;
            else if (c[1] == 'h' && c[2] == 'r' && c[3] == 'e' && c[4] == 'e')
                return 3;
            else
                return -1;
        case 'f':
            if (c[1] == 'o' && c[2] == 'u' && c[3] == 'r')
                return 4;
            else if (c[1] == 'i' && c[2] == 'v' && c[3] == 'e')
                return 5;
            else
                return -1;
        case 's':
            if (c[1] == 'i' && c[2] == 'x')
                return 6;
            else if (c[1] == 'e' && c[2] == 'v' && c[3] == 'e' && c[4] == 'n')
                return 7;
            else
                return -1;
        case 'e':
            return (c[1] == 'i' && c[2] == 'g' && c[3] == 'h' && c[4] == 't') ? 8 : -1;
        case 'n':
            return (c[1] == 'i' && c[2] == 'n' && c[3] == 'e') ? 9 : -1;
    }
    return -1;
}

int main(void) {
    int num1, num2, sum, word_num;
    char buf[MAX_LENGTH];

    num1 = 0;
    num2 = 0;
    sum = 0;
    while (fgets(buf, MAX_LENGTH, stdin)) {
        for (char* c = buf; *c != '\n'; c++) {
            if (*c >= '0' && *c <= '9') {
                num1 = num1 == 0 ? *c - '0' : num1;
                num2 = *c - '0';
            } else if ((word_num = convert(c)) >= 0) {
                num1 = num1 == 0 ? word_num : num1;
                num2 = word_num;
            }
        }
        sum += num1*10 + num2;
        num1 = 0;
    }
    printf("%d\n", sum);
    return 0;
}