#pragma GCC optimize("Ofast,unroll-loops")
#include <bits/stdc++.h>
using namespace std;
int arr[100005];
char c, i, sum, c1;
int main(){

    while(scanf(" %c %c", &c,&c1)!=EOF){
        if(c=='+') arr[i++]=1;
        else arr[i++]=-1;
    };
    for(int j = 1; j < i ;++j){
        if(arr[j-1]!=arr[j])++sum;
        //if(j-2<i && arr[j-2]!=arr[j])sum++;
    }
    printf("%d\n",(sum+1)/2);
    
    return 0;
}