import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.NoSuchElementException;

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;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; 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() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    public double nextDouble() { return Double.parseDouble(next());}
}

class Main {
	public static void main(String[] args) {
		new Main().run();
	}
	
	final long MOD=(long)1e9+7;
	
	void run() {
		FastScanner sc = new FastScanner();
		char[] cs=sc.next().toCharArray();
		int N=cs.length;
		long[] pw2=new long[N+1];
		{
			pw2[0]=1;
			for (int i=1;i<pw2.length;++i) pw2[i]=2*pw2[i-1]%MOD;
		}
		long ans=0;
		for (int i=0;i<27;++i) {
			long[] sum1=new long[N];
			long[] sum2=new long[N];
			long[] sum3=new long[N];
			int[] cnt=new int[N];
			for (int j=0;j<N;++j) {
				if (j!=0) sum1[j]=sum1[j-1];
				if (cs[j]!=(char)('a'+i)) {
					sum1[j]+=pw2[j];
					sum1[j]%=MOD;
				}
			}
			for (int j=N-1;j>=0;--j) {
				if (j!=N-1) sum2[j]=sum2[j+1];
				if (cs[j]!=(char)('a'+i)) {
					sum2[j]+=pw2[N-1-j];
					sum2[j]%=MOD;
				}
			}
			
			for (int j=0;j<N;++j) {
				if (cs[j]!=(char)('a'+i)) {
					continue;
				}
				ans+=(sum1[j]+1)*pw2[N-1-j]%MOD;
				ans%=MOD;
			}
			tr(i,ans);
		}
		System.out.println(ans);
	}
	
	void tr(Object...o) {System.out.println(Arrays.deepToString(o));}
}