import std.stdio, std.string, std.conv, std.algorithm, std.numeric;
import std.range, std.array, std.math, std.typecons, std.container, core.bitop;

void main() {
    while (true) {
        string s;
        scan(s);

        if (s == "#") return;

        solve(s);
    }
}

void solve(string s) {
    auto h = "qwertasdfgzxcvb";

    int res;

    foreach (int i, ch; s) {
        if (i == 0) continue;
        res += h.canFind(ch) ^ h.canFind(s[i-1]);
    }

    writeln(res);
}


void scan(T...)(ref T args) {
    string[] line = readln.split;
    foreach (ref arg; args) {
        arg = line.front.to!(typeof(arg));
        line.popFront();
    }
    assert(line.empty);
}



void fillAll(R, T)(ref R arr, T value) {
    static if (is(typeof(arr[] = value))) {
        arr[] = value;
    }
    else {
        foreach (ref e; arr) {
            fillAll(e, value);
        }
    }
}