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use std::io::{BufRead};
const GROUP_SIZE: usize = 3;
fn main() {
let stdin = std::io::stdin();
let mut handle = stdin.lock();
let all_ones: u64 = {
let mut ret: u64 = 0;
for i in 0..64 {
ret |= 1 << i;
}
ret
};
let mut result: usize = 0;
let mut buf: Vec<u8> = Vec::new();
let mut done: bool = false;
loop {
let mut set: u64 = all_ones;
for i in 0..GROUP_SIZE {
buf.clear();
let num_bytes = handle.read_until(b'\n', &mut buf).expect("IO error");
if num_bytes == 0 {
if i == 0 {
done = true;
break;
}
else { panic!("Malformed input"); }
}
let stripped_buf: & [u8] = {
if buf[buf.len() - 1] == b'\n' {
& buf[0..buf.len()-1]
}
else {
& buf
}
};
assert!(!stripped_buf.is_empty());
let mut seen: u64 = 0;
for &c in stripped_buf {
assert!((c >= 65 && c <= 90) || (c >= 97 && c <= 122));
if c <= 90 {
seen |= 1 << (c - b'A');
}
else {
seen |= 1 << (c - b'a' + 26);
}
}
set &= seen;
}
if done { break; }
assert_eq!(set.count_ones(), 1);
for i in 0..26 {
if set & (1 << i) != 0 {
result += 26 + i + 1;
break;
}
if set & (1 << (26 + i)) != 0 {
result += i + 1;
break;
}
}
}
println!("{}", result);
}
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