#include <stdio.h>
#include <string.h>



int main()
{
	FILE *in = fopen("text.in", "r");
	FILE *out = fopen("text.out", "w");

	long nbChars = 0;
	long nbWords = 0;
	char c;
	char oldCh = ' ';
	bool lastChIsLetter = false;
	while((c=getc(in))!=EOF) 
	{
		switch (c)
		{
			case ' ':
			case ',':
			case '!':
			case '?':
			case '.':
			case '\n':
			case '-':
			case '+':
			case '/':
				lastChIsLetter = false;
				break;
			/*case 0:
			case 1:
			case 2:
			case 3:
			case 4:
			case 5:
			case 6:
			case 7:
			case 8:
			case 9:*/
				
				
				//break;
			default:
				nbChars ++;
				if (!lastChIsLetter)
					nbWords ++;
				lastChIsLetter = true;
				break;
		}

		oldCh = c;
	}

	fprintf(out, "%ld", nbChars/nbWords);
	fclose(in);
	fclose(out);
}