#include <stdio.h> int main () {char ch; int a,b,c,d; a=0; b=0; c=0; d=0; while((ch=getchar())!='\n'); {if(ch>='a'&amp;&amp;ch<='z'||ch<='z'&amp;&amp;ch>='a') {a=a+1;} else if(ch==' ') {b=b+1;} else if(ch>='0'&amp;&amp;ch<='9') {c=c+1;} else {d=d+1;} } printf...