#include <stdio.h>
int f(char*s){int t=0,u;for(;*++s;u=*s-s[-1],t+=(u=u<0?-u:u)>13?26-u:u);return t;}
int main(){
printf("%d\n%d\n%d\n%d\n%d\n",f
("aa"),f
("stack"),f
("zaza"),f
("valleys"),f
("nwrlbb")); }
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