import java.io.*; import java.math.*; import java.util.*; import java.util.Map.Entry; class Main { static int[] vy = {1,0,-1,0}; static int[] vx = {0,1,0,-1}; static long mod = 1000000007; static HashMap map = new HashMap(); public static void main(String[] args) { FastScanner sc = new FastScanner(); //Scanner sc = new Scanner(System.in); char[] s = sc.next().toCharArray(); int[] sum = new int[s.length]; for(int i = s.length-1; i > 0; i--) { if(s[i] == 'w') sum[i]++; sum[i-1] = sum[i]; } BigInteger bi = new BigInteger("0"); for(int i = 0; i < s.length; i++) { if(s[i] == 'c') { bi = bi.add(new BigInteger(String.valueOf(sum[i])).multiply(new BigInteger(String.valueOf(sum[i]-1))).divide(new BigInteger("2"))); } } System.out.println(bi.toString(10)); } static class FastScanner { private final InputStream in = System.in; private final byte[] buffer = new byte[1024]; private int ptr = 0; private int buflen = 0; private boolean hasNextByte() { if (ptr < buflen) { return true; }else{ ptr = 0; try { buflen = in.read(buffer); } catch (IOException e) { e.printStackTrace(); } if (buflen <= 0) { return false; } } return true; } private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;} private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;} private void skipUnprintable() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;} public boolean hasNext() { skipUnprintable(); return hasNextByte();} public String next() { if (!hasNext()) throw new NoSuchElementException(); StringBuilder sb = new StringBuilder(); int b = readByte(); while(isPrintableChar(b)) { sb.appendCodePoint(b); b = readByte(); } return sb.toString(); } public long nextLong() { if (!hasNext()) throw new NoSuchElementException(); long n = 0; boolean minus = false; int b = readByte(); if (b == '-') { minus = true; b = readByte(); } if (b < '0' || '9' < b) { throw new NumberFormatException(); } while(true){ if ('0' <= b && b <= '9') { n *= 10; n += b - '0'; }else if(b == -1 || !isPrintableChar(b)){ return minus ? -n : n; }else{ throw new NumberFormatException(); } b = readByte(); } } public int nextInt() { if (!hasNext()) throw new NoSuchElementException(); int n = 0; boolean minus = false; int b = readByte(); if (b == '-') { minus = true; b = readByte(); } if (b < '0' || '9' < b) { throw new NumberFormatException(); } while(true){ if ('0' <= b && b <= '9') { n *= 10; n += b - '0'; }else if(b == -1 || !isPrintableChar(b)){ return minus ? -n : n; }else{ throw new NumberFormatException(); } b = readByte(); } } } }