/*Write a function int sumLetters(char my_string[]) 
that has one parameter, a string of characters. 
The function finds and returns the sum of ASCII values of lowercase chars ONLY. 
Write main to test your function. You can use scanf and %s to read your string. */


#include<stdio.h>
#define SIZE 20 //19 characters and \0
int sumLetters(char my_string[]);

int main(){
	char str[SIZE];
	printf("enter string\n");
	scanf("%s", str);
	printf("sum ascii of letters is %d\n",sumLetters(str));
	return 0;
}
int sumLetters(char my_string[]){
	int i=0, sum=0;
	while(my_string[i]!='\0'){
		if(my_string[i]>='a' && my_string[i]<='z')
			sum+=(int)(my_string[i]);
		i++;
	}
	return sum;
}