#include <cstdio>
#include <cstring>

using namespace std;

char vec[4096];
char *p;

int main() {
    
    freopen("text.in", "rb", stdin);
    freopen("text.out","w", stdout);
    
    fread( vec , sizeof(char), 4096 , stdin );
    
    p = strtok( vec , " " );

    int nr = 0;
    int sum = 0;
    
   
    while( p != NULL ) {
        
        sum += strlen( p );
        nr++;
        p = strtok( NULL , " " );
        
    }
    
    printf("%d", sum / nr );
    
    fclose(stdin);
    
    return 0;
    
}