#include <stdio.h>

int main() {

    char input;
    int books[100000], i = 0;

    fflush(stdin);
    while((input = getchar()) != '\n'){
        getchar();
        if (input == '+') {
            books[i] = 1;
        } else {
            books[i] = 0;
        }
        i++;
    }
    books[i] = -1;


    i = 0;
    long long flips = 0;
    while (books[i] != -1) {
        if (books[0] == 1) {
            while (books[i] == 1)
                i++;

            if (books[i] == 0) {
                while (books[i] == 0)
                    i++;
                flips++;
            }
        } else {
            while (books[i] == 0)
                i++;

            if (books[i] == 1) {
                while (books[i] == 1)
                    i++;
                flips++;
            }
        }
    }

    printf("%lld\n", flips);

    return 0;
}