#include<stdio.h>
#include<string.h>
#include<ctype.h>
#include<math.h>
FILE *f,*g;
char s[10000],i,nrl,nrc,t[1<<14];
int main()
{
f=fopen("text.in","r");
g=fopen("text.out","w");
fgets(s,10000,f);
int i,k;
for(i=0;i<strlen(s);i++)
if(isalpha(s[i]))
nrl++;
i=0;
while(i<strlen(s))
{
while(!isalpha(s[i]))
i++;
int k=0;
while(isalpha(s[i]))
{
t[k++]=s[i]-'0';
i++;
}
t[k]='\0';
if(k!=0)
nrc++;
}
fprintf(g,"%d",nrl/nrc);
return 0;
}