include<stdio.h>

include<string.h>

int KeyTable[26]={1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,4,1,2,3,1,2,3,4};
int main()
{
char str[200];
while(scanf("%s",str)!=EOF)
{
int time=0;
int len=strlen(str);
for(int i=0;i<len;i++)
{
time+=KeyTable[str[i]-'a'];
if(i!=0&&str[i]-str[i-1]==KeyTable[str[i]-'a']-KeyTable[str[i-1]-'a'])
{
time+=2;
}
}
printf("%d",time);
}
}