01: #include <stdio.h>
02:
03:
04: int main(void)
05: {
06: int i;
07: char s[20];
08:
09: printf("Input: ");
10: scanf("%s", s);
11: for(i = 0;s[i] != '\0';i++)
12: {
13: if('a'<=s[i] && s[i]<='z')
14: {
15: printf("%c", s[i]);
16: }
17: }
18: return 0;
19: }