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#include <bits/stdc++.h>
using namespace std;
FILE *fi, *fo;
int rt() {
long long nrcuv, lt, l;
char ch;
nrcuv=lt=0;
ch=fgetc(fi);
while(ch!=EOF) {
while((ch<'a' || ch>'z') && (ch<'A' || ch>'Z') && ch!=EOF)
ch=fgetc(fi);
if((ch>='a' && ch<='z') || (ch>='A' && ch<='Z'))
nrcuv++;
l=0;
while((ch>='a' && ch<='z') || (ch>='A' && ch<='Z')) {
ch=fgetc(fi);
l++;
}
lt+=l;
}
return lt/nrcuv;
}
int main()
{
fi = fopen("text.in", "r");
fo = fopen("text.out", "w");
fprintf(fo, "%d", rt());
fclose(fi);
fclose(fo);
return 0;
}